/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/nla-digbench-scaling/egcd-ll_unwindbound50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 23:15:25,406 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 23:15:25,408 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 23:15:25,433 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 23:15:25,433 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 23:15:25,434 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 23:15:25,435 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 23:15:25,438 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 23:15:25,439 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 23:15:25,439 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 23:15:25,440 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 23:15:25,441 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 23:15:25,441 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 23:15:25,441 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 23:15:25,442 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 23:15:25,443 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 23:15:25,443 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 23:15:25,444 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 23:15:25,445 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 23:15:25,446 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 23:15:25,446 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 23:15:25,453 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 23:15:25,454 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 23:15:25,454 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 23:15:25,457 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-03-31 23:15:25,458 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 23:15:25,459 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 23:15:25,459 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 23:15:25,460 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 23:15:25,460 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 23:15:25,460 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 23:15:25,461 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 23:15:25,461 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 23:15:25,461 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 23:15:25,462 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 23:15:25,462 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 23:15:25,463 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 23:15:25,487 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 23:15:25,488 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 23:15:25,488 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 23:15:25,488 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 23:15:25,489 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 23:15:25,489 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 23:15:25,489 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 23:15:25,489 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 23:15:25,489 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 23:15:25,489 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 23:15:25,490 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 23:15:25,490 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 23:15:25,490 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 23:15:25,490 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 23:15:25,490 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 23:15:25,490 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 23:15:25,490 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 23:15:25,491 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 23:15:25,491 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 23:15:25,491 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 23:15:25,491 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 23:15:25,491 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 23:15:25,491 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 23:15:25,491 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 23:15:25,492 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 23:15:25,492 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 23:15:25,492 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 23:15:25,492 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 23:15:25,492 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 23:15:25,492 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 23:15:25,492 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 23:15:25,492 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 23:15:25,493 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 23:15:25,493 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 23:15:25,493 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 23:15:25,493 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 23:15:25,493 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 23:15:25,493 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 23:15:25,493 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 23:15:25,493 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 23:15:25,493 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 23:15:25,493 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 23:15:25,683 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 23:15:25,705 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 23:15:25,707 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 23:15:25,708 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 23:15:25,708 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 23:15:25,709 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c [2023-03-31 23:15:26,679 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 23:15:26,840 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 23:15:26,841 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c [2023-03-31 23:15:26,844 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1252a5c0b/35a4aa6b1c5744a1a31aeab14e561105/FLAG8ff51c2cc [2023-03-31 23:15:26,857 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1252a5c0b/35a4aa6b1c5744a1a31aeab14e561105 [2023-03-31 23:15:26,858 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 23:15:26,859 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 23:15:26,860 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 23:15:26,860 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 23:15:26,874 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 23:15:26,874 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 11:15:26" (1/1) ... [2023-03-31 23:15:26,875 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@18ae85a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:15:26, skipping insertion in model container [2023-03-31 23:15:26,875 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 11:15:26" (1/1) ... [2023-03-31 23:15:26,880 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 23:15:26,891 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 23:15:26,981 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c[489,502] [2023-03-31 23:15:26,991 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 23:15:26,996 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 23:15:27,003 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/egcd-ll_unwindbound50.c[489,502] [2023-03-31 23:15:27,008 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 23:15:27,015 INFO L208 MainTranslator]: Completed translation [2023-03-31 23:15:27,015 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:15:27 WrapperNode [2023-03-31 23:15:27,015 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 23:15:27,016 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 23:15:27,016 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 23:15:27,016 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 23:15:27,023 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:15:27" (1/1) ... [2023-03-31 23:15:27,023 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:15:27" (1/1) ... [2023-03-31 23:15:27,026 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:15:27" (1/1) ... [2023-03-31 23:15:27,027 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:15:27" (1/1) ... [2023-03-31 23:15:27,029 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:15:27" (1/1) ... [2023-03-31 23:15:27,031 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:15:27" (1/1) ... [2023-03-31 23:15:27,032 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:15:27" (1/1) ... [2023-03-31 23:15:27,032 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:15:27" (1/1) ... [2023-03-31 23:15:27,033 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 23:15:27,034 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 23:15:27,034 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 23:15:27,034 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 23:15:27,034 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:15:27" (1/1) ... [2023-03-31 23:15:27,038 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 23:15:27,044 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:15:27,056 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 23:15:27,064 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 23:15:27,086 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 23:15:27,086 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 23:15:27,086 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 23:15:27,086 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-03-31 23:15:27,086 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-03-31 23:15:27,086 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 23:15:27,086 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 23:15:27,086 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 23:15:27,086 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 23:15:27,087 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 23:15:27,087 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-03-31 23:15:27,087 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-03-31 23:15:27,087 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-03-31 23:15:27,087 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 23:15:27,087 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 23:15:27,087 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 23:15:27,087 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 23:15:27,087 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 23:15:27,087 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 23:15:27,087 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 23:15:27,128 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 23:15:27,130 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 23:15:27,237 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 23:15:27,272 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 23:15:27,272 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-03-31 23:15:27,273 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 11:15:27 BoogieIcfgContainer [2023-03-31 23:15:27,273 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 23:15:27,274 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 23:15:27,275 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 23:15:27,276 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 23:15:27,276 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 11:15:26" (1/3) ... [2023-03-31 23:15:27,277 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7de611a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 11:15:27, skipping insertion in model container [2023-03-31 23:15:27,277 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 11:15:27" (2/3) ... [2023-03-31 23:15:27,277 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7de611a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 11:15:27, skipping insertion in model container [2023-03-31 23:15:27,277 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 11:15:27" (3/3) ... [2023-03-31 23:15:27,278 INFO L112 eAbstractionObserver]: Analyzing ICFG egcd-ll_unwindbound50.c [2023-03-31 23:15:27,288 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 23:15:27,288 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 23:15:27,317 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 23:15:27,321 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;@511ed306, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 23:15:27,321 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 23:15:27,324 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-03-31 23:15:27,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-03-31 23:15:27,328 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:15:27,329 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:15:27,329 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:15:27,332 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:15:27,332 INFO L85 PathProgramCache]: Analyzing trace with hash 1989446445, now seen corresponding path program 1 times [2023-03-31 23:15:27,338 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:15:27,338 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180155305] [2023-03-31 23:15:27,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:27,338 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:15:27,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:15:27,464 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-03-31 23:15:27,465 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:15:27,465 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [180155305] [2023-03-31 23:15:27,465 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [180155305] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 23:15:27,465 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 23:15:27,465 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-03-31 23:15:27,466 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111408629] [2023-03-31 23:15:27,467 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 23:15:27,469 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-03-31 23:15:27,469 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:15:27,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-03-31 23:15:27,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-03-31 23:15:27,504 INFO L87 Difference]: Start difference. First operand has 30 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 14 states have internal predecessors, (18), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-03-31 23:15:27,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:15:27,525 INFO L93 Difference]: Finished difference Result 50 states and 76 transitions. [2023-03-31 23:15:27,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-03-31 23:15:27,543 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 17 [2023-03-31 23:15:27,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:15:27,550 INFO L225 Difference]: With dead ends: 50 [2023-03-31 23:15:27,550 INFO L226 Difference]: Without dead ends: 26 [2023-03-31 23:15:27,553 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-03-31 23:15:27,557 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:15:27,557 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:15:27,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-03-31 23:15:27,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-03-31 23:15:27,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-03-31 23:15:27,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2023-03-31 23:15:27,593 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 17 [2023-03-31 23:15:27,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:15:27,595 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2023-03-31 23:15:27,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-03-31 23:15:27,596 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2023-03-31 23:15:27,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-03-31 23:15:27,598 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:15:27,598 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:15:27,598 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 23:15:27,598 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:15:27,600 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:15:27,600 INFO L85 PathProgramCache]: Analyzing trace with hash 894685111, now seen corresponding path program 1 times [2023-03-31 23:15:27,600 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:15:27,600 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673462595] [2023-03-31 23:15:27,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:27,600 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:15:27,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:15:27,809 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-03-31 23:15:27,809 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:15:27,810 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673462595] [2023-03-31 23:15:27,810 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [673462595] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 23:15:27,810 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 23:15:27,810 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-03-31 23:15:27,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333274598] [2023-03-31 23:15:27,810 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 23:15:27,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-03-31 23:15:27,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:15:27,812 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-03-31 23:15:27,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-03-31 23:15:27,812 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-03-31 23:15:27,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:15:27,845 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2023-03-31 23:15:27,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-03-31 23:15:27,845 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 18 [2023-03-31 23:15:27,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:15:27,846 INFO L225 Difference]: With dead ends: 38 [2023-03-31 23:15:27,846 INFO L226 Difference]: Without dead ends: 28 [2023-03-31 23:15:27,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-03-31 23:15:27,847 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 3 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:15:27,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 78 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:15:27,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2023-03-31 23:15:27,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2023-03-31 23:15:27,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 14 states have internal predecessors, (16), 11 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-03-31 23:15:27,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 36 transitions. [2023-03-31 23:15:27,861 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 36 transitions. Word has length 18 [2023-03-31 23:15:27,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:15:27,861 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 36 transitions. [2023-03-31 23:15:27,861 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-03-31 23:15:27,861 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 36 transitions. [2023-03-31 23:15:27,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-03-31 23:15:27,862 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:15:27,862 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:15:27,862 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-03-31 23:15:27,862 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:15:27,862 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:15:27,863 INFO L85 PathProgramCache]: Analyzing trace with hash 896353407, now seen corresponding path program 1 times [2023-03-31 23:15:27,863 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:15:27,863 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1495263092] [2023-03-31 23:15:27,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:27,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:15:27,891 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 23:15:27,892 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1560565883] [2023-03-31 23:15:27,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:27,892 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:27,892 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:15:27,894 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 23:15:27,933 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 23:15:27,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:15:27,978 INFO L262 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 17 conjunts are in the unsatisfiable core [2023-03-31 23:15:27,982 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:15:28,050 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 23:15:28,051 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:15:28,120 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-03-31 23:15:28,120 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:15:28,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1495263092] [2023-03-31 23:15:28,120 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 23:15:28,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1560565883] [2023-03-31 23:15:28,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1560565883] provided 1 perfect and 1 imperfect interpolant sequences [2023-03-31 23:15:28,121 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-03-31 23:15:28,121 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2023-03-31 23:15:28,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691711027] [2023-03-31 23:15:28,121 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 23:15:28,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 23:15:28,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:15:28,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 23:15:28,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-03-31 23:15:28,122 INFO L87 Difference]: Start difference. First operand 28 states and 36 transitions. Second operand has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-03-31 23:15:28,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:15:28,649 INFO L93 Difference]: Finished difference Result 42 states and 56 transitions. [2023-03-31 23:15:28,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-03-31 23:15:28,649 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 18 [2023-03-31 23:15:28,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:15:28,650 INFO L225 Difference]: With dead ends: 42 [2023-03-31 23:15:28,650 INFO L226 Difference]: Without dead ends: 40 [2023-03-31 23:15:28,650 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2023-03-31 23:15:28,652 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 7 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 2 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-03-31 23:15:28,652 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 104 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 49 Invalid, 3 Unknown, 0 Unchecked, 0.5s Time] [2023-03-31 23:15:28,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-03-31 23:15:28,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2023-03-31 23:15:28,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 19 states have internal predecessors, (21), 17 states have call successors, (17), 5 states have call predecessors, (17), 4 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2023-03-31 23:15:28,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 53 transitions. [2023-03-31 23:15:28,665 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 53 transitions. Word has length 18 [2023-03-31 23:15:28,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:15:28,669 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 53 transitions. [2023-03-31 23:15:28,669 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 4 states have internal predecessors, (9), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-03-31 23:15:28,669 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 53 transitions. [2023-03-31 23:15:28,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-03-31 23:15:28,671 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:15:28,672 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:15:28,677 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 23:15:28,872 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 23:15:28,873 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:15:28,873 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:15:28,873 INFO L85 PathProgramCache]: Analyzing trace with hash 500857910, now seen corresponding path program 1 times [2023-03-31 23:15:28,873 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:15:28,874 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910606279] [2023-03-31 23:15:28,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:28,874 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:15:28,882 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 23:15:28,882 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1379270811] [2023-03-31 23:15:28,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:28,882 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:28,883 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:15:28,883 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 23:15:28,888 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 23:15:28,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:15:28,950 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 23 conjunts are in the unsatisfiable core [2023-03-31 23:15:28,951 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:15:29,089 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-03-31 23:15:29,089 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:15:29,163 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:15:29,163 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910606279] [2023-03-31 23:15:29,163 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 23:15:29,163 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379270811] [2023-03-31 23:15:29,164 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1379270811] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:15:29,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2103380542] [2023-03-31 23:15:29,176 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-03-31 23:15:29,176 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:15:29,178 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:15:29,181 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:15:29,181 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:15:29,222 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 12 for LOIs [2023-03-31 23:15:29,412 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2023-03-31 23:15:29,436 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2023-03-31 23:15:29,438 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 23:15:29,444 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:15:29,876 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '601#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= ~counter~0 1) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:15:29,876 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:15:29,877 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-03-31 23:15:29,877 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2023-03-31 23:15:29,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426986862] [2023-03-31 23:15:29,877 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-03-31 23:15:29,877 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-03-31 23:15:29,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:15:29,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-03-31 23:15:29,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=694, Unknown=0, NotChecked=0, Total=812 [2023-03-31 23:15:29,880 INFO L87 Difference]: Start difference. First operand 39 states and 53 transitions. Second operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-03-31 23:15:30,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:15:30,007 INFO L93 Difference]: Finished difference Result 46 states and 59 transitions. [2023-03-31 23:15:30,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-03-31 23:15:30,007 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 1.625) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 23 [2023-03-31 23:15:30,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:15:30,010 INFO L225 Difference]: With dead ends: 46 [2023-03-31 23:15:30,010 INFO L226 Difference]: Without dead ends: 44 [2023-03-31 23:15:30,011 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=132, Invalid=798, Unknown=0, NotChecked=0, Total=930 [2023-03-31 23:15:30,014 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 18 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:15:30,017 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 79 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:15:30,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-03-31 23:15:30,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2023-03-31 23:15:30,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 20 states have (on average 1.2) internal successors, (24), 22 states have internal predecessors, (24), 17 states have call successors, (17), 6 states have call predecessors, (17), 5 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2023-03-31 23:15:30,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 56 transitions. [2023-03-31 23:15:30,039 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 56 transitions. Word has length 23 [2023-03-31 23:15:30,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:15:30,041 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 56 transitions. [2023-03-31 23:15:30,041 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 1.625) internal successors, (13), 8 states have internal predecessors, (13), 3 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-03-31 23:15:30,041 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 56 transitions. [2023-03-31 23:15:30,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-03-31 23:15:30,042 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:15:30,042 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:15:30,046 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 23:15:30,242 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 23:15:30,242 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:15:30,243 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:15:30,243 INFO L85 PathProgramCache]: Analyzing trace with hash -2072275297, now seen corresponding path program 1 times [2023-03-31 23:15:30,243 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:15:30,243 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623689283] [2023-03-31 23:15:30,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:30,243 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:15:30,253 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 23:15:30,253 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1310351840] [2023-03-31 23:15:30,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:30,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:30,253 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:15:30,254 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 23:15:30,256 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 23:15:30,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:15:30,290 INFO L262 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 22 conjunts are in the unsatisfiable core [2023-03-31 23:15:30,291 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:15:30,353 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-03-31 23:15:30,353 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:15:30,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:15:30,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623689283] [2023-03-31 23:15:30,411 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 23:15:30,411 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1310351840] [2023-03-31 23:15:30,411 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1310351840] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 23:15:30,411 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [448046787] [2023-03-31 23:15:30,412 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-03-31 23:15:30,412 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:15:30,413 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:15:30,413 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:15:30,413 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:15:30,429 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 12 for LOIs [2023-03-31 23:15:30,580 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2023-03-31 23:15:30,589 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2023-03-31 23:15:30,590 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 23:15:30,593 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:15:30,988 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '884#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= ~counter~0 1) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:15:30,988 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:15:30,988 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-03-31 23:15:30,989 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2023-03-31 23:15:30,989 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511386473] [2023-03-31 23:15:30,989 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-03-31 23:15:30,989 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-03-31 23:15:30,989 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:15:30,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-03-31 23:15:30,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=648, Unknown=0, NotChecked=0, Total=756 [2023-03-31 23:15:30,990 INFO L87 Difference]: Start difference. First operand 43 states and 56 transitions. Second operand has 9 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-03-31 23:15:31,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:15:31,102 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2023-03-31 23:15:31,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-03-31 23:15:31,103 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) Word has length 28 [2023-03-31 23:15:31,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:15:31,103 INFO L225 Difference]: With dead ends: 50 [2023-03-31 23:15:31,103 INFO L226 Difference]: Without dead ends: 46 [2023-03-31 23:15:31,104 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=122, Invalid=748, Unknown=0, NotChecked=0, Total=870 [2023-03-31 23:15:31,104 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 17 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:15:31,104 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 83 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:15:31,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-03-31 23:15:31,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2023-03-31 23:15:31,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 23 states have (on average 1.173913043478261) internal successors, (27), 25 states have internal predecessors, (27), 16 states have call successors, (16), 7 states have call predecessors, (16), 6 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-03-31 23:15:31,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 56 transitions. [2023-03-31 23:15:31,110 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 56 transitions. Word has length 28 [2023-03-31 23:15:31,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:15:31,110 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 56 transitions. [2023-03-31 23:15:31,110 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-03-31 23:15:31,110 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 56 transitions. [2023-03-31 23:15:31,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2023-03-31 23:15:31,111 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:15:31,111 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:15:31,115 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 23:15:31,315 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 23:15:31,316 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:15:31,316 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:15:31,316 INFO L85 PathProgramCache]: Analyzing trace with hash 1248754561, now seen corresponding path program 1 times [2023-03-31 23:15:31,316 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:15:31,316 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110872248] [2023-03-31 23:15:31,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:31,316 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:15:31,322 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 23:15:31,322 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [662663687] [2023-03-31 23:15:31,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:31,323 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:31,323 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:15:31,323 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 23:15:31,325 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 23:15:31,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:15:31,358 INFO L262 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 8 conjunts are in the unsatisfiable core [2023-03-31 23:15:31,359 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:15:31,369 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-03-31 23:15:31,369 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 23:15:31,369 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:15:31,369 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110872248] [2023-03-31 23:15:31,369 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 23:15:31,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [662663687] [2023-03-31 23:15:31,370 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [662663687] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 23:15:31,370 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 23:15:31,370 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 23:15:31,370 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109199971] [2023-03-31 23:15:31,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 23:15:31,370 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 23:15:31,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:15:31,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 23:15:31,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 23:15:31,371 INFO L87 Difference]: Start difference. First operand 46 states and 56 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-03-31 23:15:31,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:15:31,399 INFO L93 Difference]: Finished difference Result 56 states and 68 transitions. [2023-03-31 23:15:31,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-03-31 23:15:31,399 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 34 [2023-03-31 23:15:31,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:15:31,400 INFO L225 Difference]: With dead ends: 56 [2023-03-31 23:15:31,400 INFO L226 Difference]: Without dead ends: 54 [2023-03-31 23:15:31,400 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-03-31 23:15:31,400 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 5 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-03-31 23:15:31,401 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 112 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-03-31 23:15:31,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2023-03-31 23:15:31,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 51. [2023-03-31 23:15:31,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 29 states have internal predecessors, (30), 17 states have call successors, (17), 8 states have call predecessors, (17), 7 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2023-03-31 23:15:31,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 61 transitions. [2023-03-31 23:15:31,406 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 61 transitions. Word has length 34 [2023-03-31 23:15:31,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:15:31,406 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 61 transitions. [2023-03-31 23:15:31,407 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (8), 2 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-03-31 23:15:31,407 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 61 transitions. [2023-03-31 23:15:31,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-03-31 23:15:31,407 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:15:31,407 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:15:31,425 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-03-31 23:15:31,625 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 23:15:31,625 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:15:31,626 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:15:31,626 INFO L85 PathProgramCache]: Analyzing trace with hash 1865171584, now seen corresponding path program 1 times [2023-03-31 23:15:31,626 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:15:31,626 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1430328155] [2023-03-31 23:15:31,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:31,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:15:31,636 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 23:15:31,636 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1924998555] [2023-03-31 23:15:31,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:31,637 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:31,637 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:15:31,637 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 23:15:31,653 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 23:15:31,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:15:31,685 INFO L262 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 7 conjunts are in the unsatisfiable core [2023-03-31 23:15:31,686 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:15:31,719 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-03-31 23:15:31,719 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:15:31,759 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-03-31 23:15:31,760 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:15:31,760 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1430328155] [2023-03-31 23:15:31,760 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 23:15:31,760 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1924998555] [2023-03-31 23:15:31,760 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1924998555] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:15:31,760 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [43851852] [2023-03-31 23:15:31,761 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-03-31 23:15:31,761 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:15:31,762 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:15:31,762 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:15:31,762 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:15:31,775 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 12 for LOIs [2023-03-31 23:15:32,141 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2023-03-31 23:15:32,144 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2023-03-31 23:15:32,145 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 23:15:32,148 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:15:32,543 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1543#(and (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:15:32,543 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:15:32,543 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 23:15:32,543 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2023-03-31 23:15:32,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608651408] [2023-03-31 23:15:32,544 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 23:15:32,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-03-31 23:15:32,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:15:32,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-03-31 23:15:32,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=489, Unknown=0, NotChecked=0, Total=600 [2023-03-31 23:15:32,545 INFO L87 Difference]: Start difference. First operand 51 states and 61 transitions. Second operand has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 6 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) [2023-03-31 23:15:32,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:15:32,629 INFO L93 Difference]: Finished difference Result 113 states and 136 transitions. [2023-03-31 23:15:32,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-03-31 23:15:32,629 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 6 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) Word has length 36 [2023-03-31 23:15:32,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:15:32,631 INFO L225 Difference]: With dead ends: 113 [2023-03-31 23:15:32,631 INFO L226 Difference]: Without dead ends: 101 [2023-03-31 23:15:32,631 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=131, Invalid=625, Unknown=0, NotChecked=0, Total=756 [2023-03-31 23:15:32,632 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 44 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:15:32,632 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 136 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:15:32,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2023-03-31 23:15:32,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 95. [2023-03-31 23:15:32,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 55 states have internal predecessors, (59), 31 states have call successors, (31), 14 states have call predecessors, (31), 12 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2023-03-31 23:15:32,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 116 transitions. [2023-03-31 23:15:32,642 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 116 transitions. Word has length 36 [2023-03-31 23:15:32,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:15:32,643 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 116 transitions. [2023-03-31 23:15:32,643 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.375) internal successors, (27), 8 states have internal predecessors, (27), 6 states have call successors, (14), 5 states have call predecessors, (14), 4 states have return successors, (12), 4 states have call predecessors, (12), 5 states have call successors, (12) [2023-03-31 23:15:32,643 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 116 transitions. [2023-03-31 23:15:32,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-03-31 23:15:32,644 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:15:32,644 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:15:32,668 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 23:15:32,848 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 23:15:32,848 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:15:32,849 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:15:32,849 INFO L85 PathProgramCache]: Analyzing trace with hash 1866839880, now seen corresponding path program 1 times [2023-03-31 23:15:32,849 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:15:32,849 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296709360] [2023-03-31 23:15:32,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:32,849 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:15:32,855 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 23:15:32,855 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1870601328] [2023-03-31 23:15:32,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:32,855 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:32,856 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:15:32,856 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 23:15:32,858 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 23:15:32,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:15:32,895 INFO L262 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 25 conjunts are in the unsatisfiable core [2023-03-31 23:15:32,896 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:15:33,012 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 4 proven. 11 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-03-31 23:15:33,012 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:15:33,113 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 8 proven. 7 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-03-31 23:15:33,114 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:15:33,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296709360] [2023-03-31 23:15:33,114 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 23:15:33,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870601328] [2023-03-31 23:15:33,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870601328] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:15:33,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2039613208] [2023-03-31 23:15:33,115 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-03-31 23:15:33,115 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:15:33,116 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:15:33,116 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:15:33,116 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:15:33,127 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 12 for LOIs [2023-03-31 23:15:33,330 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2023-03-31 23:15:33,333 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2023-03-31 23:15:33,334 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 23:15:33,336 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:15:33,630 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2103#(and (<= ~counter~0 51) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:15:33,630 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:15:33,630 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 23:15:33,630 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 11 [2023-03-31 23:15:33,630 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506410416] [2023-03-31 23:15:33,631 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 23:15:33,631 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-03-31 23:15:33,631 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:15:33,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-03-31 23:15:33,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=612, Unknown=0, NotChecked=0, Total=702 [2023-03-31 23:15:33,632 INFO L87 Difference]: Start difference. First operand 95 states and 116 transitions. Second operand has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-03-31 23:15:33,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:15:33,821 INFO L93 Difference]: Finished difference Result 109 states and 129 transitions. [2023-03-31 23:15:33,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-03-31 23:15:33,822 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 36 [2023-03-31 23:15:33,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:15:33,823 INFO L225 Difference]: With dead ends: 109 [2023-03-31 23:15:33,824 INFO L226 Difference]: Without dead ends: 107 [2023-03-31 23:15:33,824 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=106, Invalid=706, Unknown=0, NotChecked=0, Total=812 [2023-03-31 23:15:33,824 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 19 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 29 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 23:15:33,825 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [29 Valid, 141 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 23:15:33,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2023-03-31 23:15:33,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2023-03-31 23:15:33,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 60 states have (on average 1.1333333333333333) internal successors, (68), 64 states have internal predecessors, (68), 31 states have call successors, (31), 17 states have call predecessors, (31), 15 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2023-03-31 23:15:33,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 125 transitions. [2023-03-31 23:15:33,835 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 125 transitions. Word has length 36 [2023-03-31 23:15:33,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:15:33,836 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 125 transitions. [2023-03-31 23:15:33,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.5454545454545454) internal successors, (28), 10 states have internal predecessors, (28), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-03-31 23:15:33,836 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 125 transitions. [2023-03-31 23:15:33,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-03-31 23:15:33,836 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:15:33,836 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:15:33,843 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-03-31 23:15:34,041 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:34,041 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:15:34,041 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:15:34,042 INFO L85 PathProgramCache]: Analyzing trace with hash -540762700, now seen corresponding path program 1 times [2023-03-31 23:15:34,042 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:15:34,042 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1764261491] [2023-03-31 23:15:34,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:34,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:15:34,052 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 23:15:34,052 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [3819961] [2023-03-31 23:15:34,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:34,052 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:34,053 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:15:34,053 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:15:34,055 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-03-31 23:15:34,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:15:34,088 INFO L262 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 18 conjunts are in the unsatisfiable core [2023-03-31 23:15:34,090 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:15:34,151 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-03-31 23:15:34,151 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:15:34,217 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 15 proven. 5 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-03-31 23:15:34,218 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:15:34,218 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1764261491] [2023-03-31 23:15:34,218 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 23:15:34,218 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [3819961] [2023-03-31 23:15:34,218 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [3819961] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:15:34,218 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1204605898] [2023-03-31 23:15:34,220 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2023-03-31 23:15:34,220 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:15:34,220 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:15:34,220 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:15:34,220 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:15:34,235 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 12 for LOIs [2023-03-31 23:15:34,363 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 15 for LOIs [2023-03-31 23:15:34,369 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2023-03-31 23:15:34,371 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 23:15:34,373 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:15:34,941 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2688#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= ~counter~0 1) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:15:34,941 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:15:34,941 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 23:15:34,941 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2023-03-31 23:15:34,941 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145078557] [2023-03-31 23:15:34,941 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 23:15:34,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-03-31 23:15:34,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:15:34,942 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-03-31 23:15:34,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=703, Unknown=0, NotChecked=0, Total=812 [2023-03-31 23:15:34,942 INFO L87 Difference]: Start difference. First operand 107 states and 125 transitions. Second operand has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2023-03-31 23:15:35,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:15:35,054 INFO L93 Difference]: Finished difference Result 124 states and 143 transitions. [2023-03-31 23:15:35,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-03-31 23:15:35,055 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) Word has length 39 [2023-03-31 23:15:35,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:15:35,056 INFO L225 Difference]: With dead ends: 124 [2023-03-31 23:15:35,056 INFO L226 Difference]: Without dead ends: 114 [2023-03-31 23:15:35,056 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=125, Invalid=805, Unknown=0, NotChecked=0, Total=930 [2023-03-31 23:15:35,057 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 15 mSDsluCounter, 69 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:15:35,057 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 92 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:15:35,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2023-03-31 23:15:35,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2023-03-31 23:15:35,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 64 states have (on average 1.109375) internal successors, (71), 68 states have internal predecessors, (71), 30 states have call successors, (30), 18 states have call predecessors, (30), 17 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2023-03-31 23:15:35,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 127 transitions. [2023-03-31 23:15:35,066 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 127 transitions. Word has length 39 [2023-03-31 23:15:35,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:15:35,066 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 127 transitions. [2023-03-31 23:15:35,066 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 5 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 4 states have call successors, (8) [2023-03-31 23:15:35,067 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 127 transitions. [2023-03-31 23:15:35,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2023-03-31 23:15:35,067 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:15:35,067 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:15:35,073 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-03-31 23:15:35,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:35,274 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:15:35,274 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:15:35,274 INFO L85 PathProgramCache]: Analyzing trace with hash 712466189, now seen corresponding path program 2 times [2023-03-31 23:15:35,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:15:35,274 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679261195] [2023-03-31 23:15:35,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:35,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:15:35,281 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 23:15:35,281 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [656465561] [2023-03-31 23:15:35,281 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:15:35,281 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:35,281 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:15:35,286 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:15:35,286 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-03-31 23:15:35,322 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-03-31 23:15:35,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:15:35,323 INFO L262 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 31 conjunts are in the unsatisfiable core [2023-03-31 23:15:35,324 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:15:35,537 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-03-31 23:15:35,537 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:15:35,732 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-03-31 23:15:35,732 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:15:35,732 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679261195] [2023-03-31 23:15:35,732 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 23:15:35,732 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [656465561] [2023-03-31 23:15:35,732 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [656465561] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:15:35,732 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1017631747] [2023-03-31 23:15:35,733 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-03-31 23:15:35,734 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:15:35,734 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:15:35,734 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:15:35,734 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:15:35,744 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 12 for LOIs [2023-03-31 23:15:35,978 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2023-03-31 23:15:35,984 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2023-03-31 23:15:35,985 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 23:15:35,987 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:15:36,331 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3314#(and (<= ~counter~0 51) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:15:36,331 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:15:36,331 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 23:15:36,331 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 14 [2023-03-31 23:15:36,331 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863056914] [2023-03-31 23:15:36,331 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 23:15:36,332 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-03-31 23:15:36,332 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:15:36,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-03-31 23:15:36,332 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=754, Unknown=0, NotChecked=0, Total=870 [2023-03-31 23:15:36,333 INFO L87 Difference]: Start difference. First operand 112 states and 127 transitions. Second operand has 14 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (13), 7 states have call predecessors, (13), 7 states have call successors, (13) [2023-03-31 23:15:38,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:15:38,015 INFO L93 Difference]: Finished difference Result 124 states and 139 transitions. [2023-03-31 23:15:38,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-03-31 23:15:38,016 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (13), 7 states have call predecessors, (13), 7 states have call successors, (13) Word has length 41 [2023-03-31 23:15:38,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:15:38,016 INFO L225 Difference]: With dead ends: 124 [2023-03-31 23:15:38,016 INFO L226 Difference]: Without dead ends: 122 [2023-03-31 23:15:38,017 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 271 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=158, Invalid=1032, Unknown=0, NotChecked=0, Total=1190 [2023-03-31 23:15:38,017 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 36 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-03-31 23:15:38,017 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 117 Invalid, 253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-03-31 23:15:38,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2023-03-31 23:15:38,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 120. [2023-03-31 23:15:38,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 70 states have (on average 1.1) internal successors, (77), 74 states have internal predecessors, (77), 30 states have call successors, (30), 20 states have call predecessors, (30), 19 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2023-03-31 23:15:38,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 133 transitions. [2023-03-31 23:15:38,028 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 133 transitions. Word has length 41 [2023-03-31 23:15:38,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:15:38,028 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 133 transitions. [2023-03-31 23:15:38,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 2.272727272727273) internal successors, (25), 10 states have internal predecessors, (25), 7 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (13), 7 states have call predecessors, (13), 7 states have call successors, (13) [2023-03-31 23:15:38,029 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 133 transitions. [2023-03-31 23:15:38,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2023-03-31 23:15:38,029 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:15:38,029 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:15:38,034 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-03-31 23:15:38,234 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-03-31 23:15:38,234 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:15:38,234 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:15:38,235 INFO L85 PathProgramCache]: Analyzing trace with hash 259908136, now seen corresponding path program 3 times [2023-03-31 23:15:38,235 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:15:38,235 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878617417] [2023-03-31 23:15:38,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:38,235 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:15:38,245 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 23:15:38,246 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [595337339] [2023-03-31 23:15:38,246 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:15:38,246 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:38,246 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:15:38,247 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:15:38,248 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-03-31 23:15:38,283 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:15:38,283 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:15:38,284 INFO L262 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 39 conjunts are in the unsatisfiable core [2023-03-31 23:15:38,285 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:15:38,549 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 16 proven. 18 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-03-31 23:15:38,549 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:15:38,941 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 20 proven. 13 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-03-31 23:15:38,942 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:15:38,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878617417] [2023-03-31 23:15:38,942 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 23:15:38,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [595337339] [2023-03-31 23:15:38,942 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [595337339] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:15:38,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1736203485] [2023-03-31 23:15:38,943 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-03-31 23:15:38,943 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:15:38,943 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:15:38,943 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:15:38,943 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:15:38,987 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 12 for LOIs [2023-03-31 23:15:39,193 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2023-03-31 23:15:39,196 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2023-03-31 23:15:39,197 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 23:15:39,199 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:15:39,631 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3986#(and (<= ~counter~0 51) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:15:39,631 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:15:39,631 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 23:15:39,631 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 17 [2023-03-31 23:15:39,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579419612] [2023-03-31 23:15:39,631 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 23:15:39,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-03-31 23:15:39,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:15:39,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-03-31 23:15:39,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=935, Unknown=0, NotChecked=0, Total=1056 [2023-03-31 23:15:39,633 INFO L87 Difference]: Start difference. First operand 120 states and 133 transitions. Second operand has 17 states, 13 states have (on average 2.230769230769231) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 7 states have call predecessors, (15), 8 states have call successors, (15) [2023-03-31 23:15:40,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:15:40,138 INFO L93 Difference]: Finished difference Result 128 states and 141 transitions. [2023-03-31 23:15:40,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-03-31 23:15:40,139 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 2.230769230769231) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 7 states have call predecessors, (15), 8 states have call successors, (15) Word has length 46 [2023-03-31 23:15:40,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:15:40,139 INFO L225 Difference]: With dead ends: 128 [2023-03-31 23:15:40,140 INFO L226 Difference]: Without dead ends: 88 [2023-03-31 23:15:40,140 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=175, Invalid=1307, Unknown=0, NotChecked=0, Total=1482 [2023-03-31 23:15:40,140 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 38 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-03-31 23:15:40,141 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 105 Invalid, 328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-03-31 23:15:40,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2023-03-31 23:15:40,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2023-03-31 23:15:40,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 55 states have (on average 1.0363636363636364) internal successors, (57), 56 states have internal predecessors, (57), 18 states have call successors, (18), 15 states have call predecessors, (18), 14 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-03-31 23:15:40,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 91 transitions. [2023-03-31 23:15:40,160 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 91 transitions. Word has length 46 [2023-03-31 23:15:40,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:15:40,160 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 91 transitions. [2023-03-31 23:15:40,161 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 2.230769230769231) internal successors, (29), 11 states have internal predecessors, (29), 8 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 7 states have call predecessors, (15), 8 states have call successors, (15) [2023-03-31 23:15:40,161 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 91 transitions. [2023-03-31 23:15:40,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-03-31 23:15:40,161 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:15:40,161 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 4, 4, 4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:15:40,179 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-03-31 23:15:40,362 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:40,362 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:15:40,362 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:15:40,362 INFO L85 PathProgramCache]: Analyzing trace with hash -2051121797, now seen corresponding path program 4 times [2023-03-31 23:15:40,362 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:15:40,362 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832521108] [2023-03-31 23:15:40,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:40,362 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:15:40,368 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 23:15:40,368 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1632815842] [2023-03-31 23:15:40,368 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 23:15:40,368 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:40,368 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:15:40,377 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:15:40,397 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-03-31 23:15:40,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:15:40,458 INFO L262 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 49 conjunts are in the unsatisfiable core [2023-03-31 23:15:40,460 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:15:42,796 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 68 proven. 45 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2023-03-31 23:15:42,796 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:15:45,275 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 68 proven. 45 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2023-03-31 23:15:45,276 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:15:45,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832521108] [2023-03-31 23:15:45,276 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 23:15:45,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1632815842] [2023-03-31 23:15:45,276 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1632815842] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:15:45,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [392632413] [2023-03-31 23:15:45,277 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-03-31 23:15:45,277 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:15:45,277 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:15:45,278 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:15:45,278 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:15:45,288 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 12 for LOIs [2023-03-31 23:15:45,463 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2023-03-31 23:15:45,466 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2023-03-31 23:15:45,466 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 23:15:45,469 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:15:46,219 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4811#(and (<= ~counter~0 51) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:15:46,220 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:15:46,220 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 23:15:46,220 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12] total 23 [2023-03-31 23:15:46,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751228899] [2023-03-31 23:15:46,220 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 23:15:46,220 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-03-31 23:15:46,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:15:46,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-03-31 23:15:46,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1318, Unknown=0, NotChecked=0, Total=1482 [2023-03-31 23:15:46,221 INFO L87 Difference]: Start difference. First operand 88 states and 91 transitions. Second operand has 23 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 16 states have internal predecessors, (41), 14 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 13 states have call predecessors, (25), 12 states have call successors, (25) [2023-03-31 23:15:52,306 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-03-31 23:15:54,309 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-03-31 23:15:55,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:15:55,735 INFO L93 Difference]: Finished difference Result 107 states and 114 transitions. [2023-03-31 23:15:55,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-03-31 23:15:55,735 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 16 states have internal predecessors, (41), 14 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 13 states have call predecessors, (25), 12 states have call successors, (25) Word has length 77 [2023-03-31 23:15:55,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:15:55,736 INFO L225 Difference]: With dead ends: 107 [2023-03-31 23:15:55,736 INFO L226 Difference]: Without dead ends: 105 [2023-03-31 23:15:55,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 192 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 581 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=254, Invalid=1816, Unknown=0, NotChecked=0, Total=2070 [2023-03-31 23:15:55,737 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 43 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 474 mSolverCounterSat, 51 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 51 IncrementalHoareTripleChecker+Valid, 474 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.4s IncrementalHoareTripleChecker+Time [2023-03-31 23:15:55,737 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 202 Invalid, 527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [51 Valid, 474 Invalid, 2 Unknown, 0 Unchecked, 6.4s Time] [2023-03-31 23:15:55,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2023-03-31 23:15:55,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 92. [2023-03-31 23:15:55,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 58 states have (on average 1.0344827586206897) internal successors, (60), 59 states have internal predecessors, (60), 18 states have call successors, (18), 16 states have call predecessors, (18), 15 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-03-31 23:15:55,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2023-03-31 23:15:55,757 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 77 [2023-03-31 23:15:55,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:15:55,757 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2023-03-31 23:15:55,757 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 16 states have internal predecessors, (41), 14 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 13 states have call predecessors, (25), 12 states have call successors, (25) [2023-03-31 23:15:55,757 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2023-03-31 23:15:55,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2023-03-31 23:15:55,760 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:15:55,760 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:15:55,766 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-03-31 23:15:55,960 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-03-31 23:15:55,961 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:15:55,961 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:15:55,962 INFO L85 PathProgramCache]: Analyzing trace with hash -14329509, now seen corresponding path program 2 times [2023-03-31 23:15:55,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:15:55,962 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1054258422] [2023-03-31 23:15:55,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:55,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:15:55,974 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 23:15:55,974 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [585282374] [2023-03-31 23:15:55,974 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:15:55,974 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:55,974 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:15:55,975 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:15:55,977 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-03-31 23:15:56,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-03-31 23:15:56,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:15:56,082 INFO L262 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 13 conjunts are in the unsatisfiable core [2023-03-31 23:15:56,084 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:15:56,167 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 260 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2023-03-31 23:15:56,167 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:15:56,263 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 44 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2023-03-31 23:15:56,264 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:15:56,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1054258422] [2023-03-31 23:15:56,264 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 23:15:56,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [585282374] [2023-03-31 23:15:56,264 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [585282374] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:15:56,264 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [735567791] [2023-03-31 23:15:56,265 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-03-31 23:15:56,265 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:15:56,265 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:15:56,265 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:15:56,266 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:15:56,290 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 12 for LOIs [2023-03-31 23:15:56,635 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2023-03-31 23:15:56,637 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2023-03-31 23:15:56,638 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 23:15:56,640 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:15:57,008 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5678#(and (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:15:57,009 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:15:57,009 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 23:15:57,009 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2023-03-31 23:15:57,009 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971613859] [2023-03-31 23:15:57,009 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 23:15:57,009 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-03-31 23:15:57,009 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:15:57,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-03-31 23:15:57,010 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=204, Invalid=726, Unknown=0, NotChecked=0, Total=930 [2023-03-31 23:15:57,010 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand has 14 states, 14 states have (on average 3.857142857142857) internal successors, (54), 14 states have internal predecessors, (54), 12 states have call successors, (32), 8 states have call predecessors, (32), 7 states have return successors, (30), 10 states have call predecessors, (30), 11 states have call successors, (30) [2023-03-31 23:15:57,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:15:57,198 INFO L93 Difference]: Finished difference Result 208 states and 216 transitions. [2023-03-31 23:15:57,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-03-31 23:15:57,198 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.857142857142857) internal successors, (54), 14 states have internal predecessors, (54), 12 states have call successors, (32), 8 states have call predecessors, (32), 7 states have return successors, (30), 10 states have call predecessors, (30), 11 states have call successors, (30) Word has length 90 [2023-03-31 23:15:57,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:15:57,199 INFO L225 Difference]: With dead ends: 208 [2023-03-31 23:15:57,199 INFO L226 Difference]: Without dead ends: 200 [2023-03-31 23:15:57,200 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 240 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 530 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=317, Invalid=1243, Unknown=0, NotChecked=0, Total=1560 [2023-03-31 23:15:57,200 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 41 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-03-31 23:15:57,200 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 134 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-03-31 23:15:57,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2023-03-31 23:15:57,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 200. [2023-03-31 23:15:57,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 130 states have (on average 1.0153846153846153) internal successors, (132), 131 states have internal predecessors, (132), 36 states have call successors, (36), 34 states have call predecessors, (36), 33 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2023-03-31 23:15:57,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 202 transitions. [2023-03-31 23:15:57,230 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 202 transitions. Word has length 90 [2023-03-31 23:15:57,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:15:57,231 INFO L495 AbstractCegarLoop]: Abstraction has 200 states and 202 transitions. [2023-03-31 23:15:57,231 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.857142857142857) internal successors, (54), 14 states have internal predecessors, (54), 12 states have call successors, (32), 8 states have call predecessors, (32), 7 states have return successors, (30), 10 states have call predecessors, (30), 11 states have call successors, (30) [2023-03-31 23:15:57,231 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 202 transitions. [2023-03-31 23:15:57,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2023-03-31 23:15:57,236 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:15:57,236 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 30, 11, 10, 10, 10, 10, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:15:57,241 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-03-31 23:15:57,441 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-03-31 23:15:57,441 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:15:57,441 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:15:57,441 INFO L85 PathProgramCache]: Analyzing trace with hash 1573716049, now seen corresponding path program 3 times [2023-03-31 23:15:57,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:15:57,442 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045738479] [2023-03-31 23:15:57,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:57,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:15:57,461 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 23:15:57,462 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1110156862] [2023-03-31 23:15:57,462 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-03-31 23:15:57,462 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:57,462 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:15:57,477 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:15:57,478 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-03-31 23:15:57,576 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-03-31 23:15:57,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-03-31 23:15:57,578 INFO L262 TraceCheckSpWp]: Trace formula consists of 434 conjuncts, 25 conjunts are in the unsatisfiable core [2023-03-31 23:15:57,580 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:15:57,790 INFO L134 CoverageAnalysis]: Checked inductivity of 2092 backedges. 60 proven. 1910 refuted. 0 times theorem prover too weak. 122 trivial. 0 not checked. [2023-03-31 23:15:57,790 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:15:58,051 INFO L134 CoverageAnalysis]: Checked inductivity of 2092 backedges. 60 proven. 290 refuted. 0 times theorem prover too weak. 1742 trivial. 0 not checked. [2023-03-31 23:15:58,051 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:15:58,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045738479] [2023-03-31 23:15:58,051 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 23:15:58,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1110156862] [2023-03-31 23:15:58,051 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1110156862] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:15:58,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1602655264] [2023-03-31 23:15:58,052 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-03-31 23:15:58,052 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:15:58,053 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:15:58,053 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:15:58,053 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:15:58,063 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 12 for LOIs [2023-03-31 23:15:58,373 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2023-03-31 23:15:58,375 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2023-03-31 23:15:58,376 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 23:15:58,378 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:15:58,731 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7497#(and (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:15:58,731 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:15:58,731 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 23:15:58,731 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2023-03-31 23:15:58,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910606641] [2023-03-31 23:15:58,731 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 23:15:58,732 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-03-31 23:15:58,732 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:15:58,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-03-31 23:15:58,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=1308, Unknown=0, NotChecked=0, Total=1806 [2023-03-31 23:15:58,734 INFO L87 Difference]: Start difference. First operand 200 states and 202 transitions. Second operand has 26 states, 26 states have (on average 4.153846153846154) internal successors, (108), 26 states have internal predecessors, (108), 24 states have call successors, (68), 14 states have call predecessors, (68), 13 states have return successors, (66), 22 states have call predecessors, (66), 23 states have call successors, (66) [2023-03-31 23:15:59,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:15:59,251 INFO L93 Difference]: Finished difference Result 424 states and 438 transitions. [2023-03-31 23:15:59,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-03-31 23:15:59,251 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 4.153846153846154) internal successors, (108), 26 states have internal predecessors, (108), 24 states have call successors, (68), 14 states have call predecessors, (68), 13 states have return successors, (66), 22 states have call predecessors, (66), 23 states have call successors, (66) Word has length 198 [2023-03-31 23:15:59,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:15:59,260 INFO L225 Difference]: With dead ends: 424 [2023-03-31 23:15:59,260 INFO L226 Difference]: Without dead ends: 416 [2023-03-31 23:15:59,262 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 552 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1265 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1013, Invalid=3019, Unknown=0, NotChecked=0, Total=4032 [2023-03-31 23:15:59,262 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 110 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-03-31 23:15:59,262 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 147 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-03-31 23:15:59,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2023-03-31 23:15:59,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 416. [2023-03-31 23:15:59,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 416 states, 274 states have (on average 1.0072992700729928) internal successors, (276), 275 states have internal predecessors, (276), 72 states have call successors, (72), 70 states have call predecessors, (72), 69 states have return successors, (70), 70 states have call predecessors, (70), 70 states have call successors, (70) [2023-03-31 23:15:59,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 418 transitions. [2023-03-31 23:15:59,354 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 418 transitions. Word has length 198 [2023-03-31 23:15:59,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:15:59,354 INFO L495 AbstractCegarLoop]: Abstraction has 416 states and 418 transitions. [2023-03-31 23:15:59,354 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 4.153846153846154) internal successors, (108), 26 states have internal predecessors, (108), 24 states have call successors, (68), 14 states have call predecessors, (68), 13 states have return successors, (66), 22 states have call predecessors, (66), 23 states have call successors, (66) [2023-03-31 23:15:59,354 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 418 transitions. [2023-03-31 23:15:59,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2023-03-31 23:15:59,358 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:15:59,358 INFO L195 NwaCegarLoop]: trace histogram [67, 66, 66, 23, 22, 22, 22, 22, 22, 22, 22, 22, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:15:59,363 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-03-31 23:15:59,563 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-03-31 23:15:59,563 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:15:59,563 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:15:59,563 INFO L85 PathProgramCache]: Analyzing trace with hash 79393597, now seen corresponding path program 4 times [2023-03-31 23:15:59,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:15:59,564 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686580085] [2023-03-31 23:15:59,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:15:59,564 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:15:59,577 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 23:15:59,577 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [507532717] [2023-03-31 23:15:59,577 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-03-31 23:15:59,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:15:59,577 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:15:59,578 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:15:59,593 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-03-31 23:15:59,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 23:15:59,735 INFO L262 TraceCheckSpWp]: Trace formula consists of 842 conjuncts, 49 conjunts are in the unsatisfiable core [2023-03-31 23:15:59,740 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 23:16:00,264 INFO L134 CoverageAnalysis]: Checked inductivity of 10144 backedges. 132 proven. 9746 refuted. 0 times theorem prover too weak. 266 trivial. 0 not checked. [2023-03-31 23:16:00,264 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 23:16:00,994 INFO L134 CoverageAnalysis]: Checked inductivity of 10144 backedges. 132 proven. 1430 refuted. 0 times theorem prover too weak. 8582 trivial. 0 not checked. [2023-03-31 23:16:00,995 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 23:16:00,995 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [686580085] [2023-03-31 23:16:00,995 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-03-31 23:16:00,995 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [507532717] [2023-03-31 23:16:00,995 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [507532717] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 23:16:00,995 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [604487901] [2023-03-31 23:16:00,997 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-03-31 23:16:00,997 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 23:16:00,997 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 23:16:00,998 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 23:16:00,998 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 23:16:01,008 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 12 for LOIs [2023-03-31 23:16:01,343 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 11 for LOIs [2023-03-31 23:16:01,346 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 10 for LOIs [2023-03-31 23:16:01,347 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-03-31 23:16:01,349 INFO L180 IcfgInterpreter]: Interpretation finished [2023-03-31 23:16:01,642 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11260#(and (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2023-03-31 23:16:01,642 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-03-31 23:16:01,642 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-03-31 23:16:01,642 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2023-03-31 23:16:01,642 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424997389] [2023-03-31 23:16:01,642 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-03-31 23:16:01,643 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2023-03-31 23:16:01,643 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 23:16:01,644 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2023-03-31 23:16:01,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1518, Invalid=2904, Unknown=0, NotChecked=0, Total=4422 [2023-03-31 23:16:01,645 INFO L87 Difference]: Start difference. First operand 416 states and 418 transitions. Second operand has 50 states, 50 states have (on average 4.32) internal successors, (216), 50 states have internal predecessors, (216), 48 states have call successors, (140), 26 states have call predecessors, (140), 25 states have return successors, (138), 46 states have call predecessors, (138), 47 states have call successors, (138) [2023-03-31 23:16:03,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 23:16:03,066 INFO L93 Difference]: Finished difference Result 856 states and 882 transitions. [2023-03-31 23:16:03,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2023-03-31 23:16:03,066 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 4.32) internal successors, (216), 50 states have internal predecessors, (216), 48 states have call successors, (140), 26 states have call predecessors, (140), 25 states have return successors, (138), 46 states have call predecessors, (138), 47 states have call successors, (138) Word has length 414 [2023-03-31 23:16:03,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 23:16:03,070 INFO L225 Difference]: With dead ends: 856 [2023-03-31 23:16:03,070 INFO L226 Difference]: Without dead ends: 848 [2023-03-31 23:16:03,074 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1286 GetRequests, 1176 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3275 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=3701, Invalid=8731, Unknown=0, NotChecked=0, Total=12432 [2023-03-31 23:16:03,074 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 251 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 251 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-03-31 23:16:03,075 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [251 Valid, 212 Invalid, 529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-03-31 23:16:03,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 848 states. [2023-03-31 23:16:03,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 848 to 848. [2023-03-31 23:16:03,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 848 states, 562 states have (on average 1.00355871886121) internal successors, (564), 563 states have internal predecessors, (564), 144 states have call successors, (144), 142 states have call predecessors, (144), 141 states have return successors, (142), 142 states have call predecessors, (142), 142 states have call successors, (142) [2023-03-31 23:16:03,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 848 states to 848 states and 850 transitions. [2023-03-31 23:16:03,273 INFO L78 Accepts]: Start accepts. Automaton has 848 states and 850 transitions. Word has length 414 [2023-03-31 23:16:03,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 23:16:03,275 INFO L495 AbstractCegarLoop]: Abstraction has 848 states and 850 transitions. [2023-03-31 23:16:03,275 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 4.32) internal successors, (216), 50 states have internal predecessors, (216), 48 states have call successors, (140), 26 states have call predecessors, (140), 25 states have return successors, (138), 46 states have call predecessors, (138), 47 states have call successors, (138) [2023-03-31 23:16:03,275 INFO L276 IsEmpty]: Start isEmpty. Operand 848 states and 850 transitions. [2023-03-31 23:16:03,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 847 [2023-03-31 23:16:03,305 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 23:16:03,305 INFO L195 NwaCegarLoop]: trace histogram [139, 138, 138, 47, 46, 46, 46, 46, 46, 46, 46, 46, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 23:16:03,311 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-03-31 23:16:03,511 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-03-31 23:16:03,511 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 23:16:03,512 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 23:16:03,512 INFO L85 PathProgramCache]: Analyzing trace with hash 440331541, now seen corresponding path program 5 times [2023-03-31 23:16:03,512 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 23:16:03,512 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170492168] [2023-03-31 23:16:03,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 23:16:03,512 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 23:16:03,536 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-03-31 23:16:03,536 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1960751617] [2023-03-31 23:16:03,536 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-03-31 23:16:03,536 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 23:16:03,536 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 23:16:03,537 INFO L229 MonitoredProcess]: Starting monitored process 15 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-03-31 23:16:03,541 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process