/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/loop-invgen/half_2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 22:09:03,347 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 22:09:03,348 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 22:09:03,378 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 22:09:03,378 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 22:09:03,381 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 22:09:03,384 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 22:09:03,385 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 22:09:03,386 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 22:09:03,390 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 22:09:03,391 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 22:09:03,392 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 22:09:03,392 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 22:09:03,394 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 22:09:03,394 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 22:09:03,397 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 22:09:03,398 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 22:09:03,398 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 22:09:03,400 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 22:09:03,403 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 22:09:03,404 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 22:09:03,404 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 22:09:03,405 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 22:09:03,406 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 22:09:03,412 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 22:09:03,412 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 22:09:03,412 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 22:09:03,413 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 22:09:03,413 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 22:09:03,413 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 22:09:03,414 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 22:09:03,414 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 22:09:03,415 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 22:09:03,415 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 22:09:03,416 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 22:09:03,416 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 22:09:03,416 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 22:09:03,416 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 22:09:03,416 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 22:09:03,417 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 22:09:03,417 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 22:09:03,418 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 22:09:03,438 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 22:09:03,439 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 22:09:03,439 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 22:09:03,439 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 22:09:03,440 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 22:09:03,440 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 22:09:03,440 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 22:09:03,440 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 22:09:03,440 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 22:09:03,440 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 22:09:03,441 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 22:09:03,441 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 22:09:03,441 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 22:09:03,441 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 22:09:03,441 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 22:09:03,441 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 22:09:03,441 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 22:09:03,441 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 22:09:03,442 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 22:09:03,442 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 22:09:03,442 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 22:09:03,442 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 22:09:03,442 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 22:09:03,442 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 22:09:03,442 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 22:09:03,442 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 22:09:03,442 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 22:09:03,442 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 22:09:03,442 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 22:09:03,443 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 22:09:03,443 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 22:09:03,443 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 22:09:03,443 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:09:03,443 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 22:09:03,443 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 22:09:03,443 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 22:09:03,443 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 22:09:03,443 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 22:09:03,443 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 22:09:03,444 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 22:09:03,444 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 22:09:03,444 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 22:09:03,614 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 22:09:03,642 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 22:09:03,643 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 22:09:03,644 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 22:09:03,647 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 22:09:03,648 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loop-invgen/half_2.i [2023-04-02 22:09:04,524 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 22:09:04,714 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 22:09:04,715 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loop-invgen/half_2.i [2023-04-02 22:09:04,719 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f1713b075/e8f6441e723743758731fe7ee38327de/FLAGf83f96fc6 [2023-04-02 22:09:04,731 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f1713b075/e8f6441e723743758731fe7ee38327de [2023-04-02 22:09:04,733 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 22:09:04,734 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 22:09:04,736 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 22:09:04,736 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 22:09:04,738 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 22:09:04,739 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:09:04" (1/1) ... [2023-04-02 22:09:04,740 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5d7a266f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:09:04, skipping insertion in model container [2023-04-02 22:09:04,740 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:09:04" (1/1) ... [2023-04-02 22:09:04,744 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 22:09:04,754 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 22:09:04,864 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/loop-invgen/half_2.i[893,906] [2023-04-02 22:09:04,870 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:09:04,876 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 22:09:04,884 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/loop-invgen/half_2.i[893,906] [2023-04-02 22:09:04,886 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:09:04,894 INFO L208 MainTranslator]: Completed translation [2023-04-02 22:09:04,895 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:09:04 WrapperNode [2023-04-02 22:09:04,895 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 22:09:04,895 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 22:09:04,895 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 22:09:04,895 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 22:09:04,902 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:09:04" (1/1) ... [2023-04-02 22:09:04,902 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:09:04" (1/1) ... [2023-04-02 22:09:04,907 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:09:04" (1/1) ... [2023-04-02 22:09:04,907 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:09:04" (1/1) ... [2023-04-02 22:09:04,918 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:09:04" (1/1) ... [2023-04-02 22:09:04,921 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:09:04" (1/1) ... [2023-04-02 22:09:04,925 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:09:04" (1/1) ... [2023-04-02 22:09:04,926 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:09:04" (1/1) ... [2023-04-02 22:09:04,929 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 22:09:04,929 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 22:09:04,929 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 22:09:04,930 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 22:09:04,931 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:09:04" (1/1) ... [2023-04-02 22:09:04,936 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:09:04,942 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:04,958 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-02 22:09:04,959 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-02 22:09:04,983 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 22:09:04,983 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 22:09:04,983 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 22:09:04,983 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-02 22:09:04,983 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 22:09:04,984 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 22:09:04,984 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 22:09:04,984 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 22:09:04,984 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-02 22:09:04,984 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-02 22:09:04,984 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 22:09:04,984 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 22:09:04,984 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-02 22:09:04,984 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 22:09:04,984 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 22:09:04,984 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 22:09:04,984 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 22:09:04,984 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 22:09:04,984 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 22:09:04,984 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 22:09:04,985 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 22:09:04,985 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 22:09:05,030 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 22:09:05,031 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 22:09:05,108 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 22:09:05,126 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 22:09:05,127 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-02 22:09:05,128 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:09:05 BoogieIcfgContainer [2023-04-02 22:09:05,128 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 22:09:05,129 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 22:09:05,130 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 22:09:05,131 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 22:09:05,131 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 10:09:04" (1/3) ... [2023-04-02 22:09:05,132 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ff0e3ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:09:05, skipping insertion in model container [2023-04-02 22:09:05,132 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:09:04" (2/3) ... [2023-04-02 22:09:05,132 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ff0e3ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:09:05, skipping insertion in model container [2023-04-02 22:09:05,132 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:09:05" (3/3) ... [2023-04-02 22:09:05,133 INFO L112 eAbstractionObserver]: Analyzing ICFG half_2.i [2023-04-02 22:09:05,144 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 22:09:05,144 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 22:09:05,173 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 22:09:05,177 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;@1dd9421c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 22:09:05,177 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 22:09:05,180 INFO L276 IsEmpty]: Start isEmpty. Operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 22:09:05,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-04-02 22:09:05,184 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:05,185 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:05,185 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:05,188 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:05,188 INFO L85 PathProgramCache]: Analyzing trace with hash -1631891170, now seen corresponding path program 1 times [2023-04-02 22:09:05,194 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:05,194 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1183595705] [2023-04-02 22:09:05,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:05,194 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:05,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:05,510 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:09:05,510 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:05,510 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1183595705] [2023-04-02 22:09:05,511 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1183595705] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:09:05,511 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:09:05,511 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-04-02 22:09:05,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612044222] [2023-04-02 22:09:05,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:09:05,515 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 22:09:05,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:05,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 22:09:05,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-04-02 22:09:05,533 INFO L87 Difference]: Start difference. First operand has 20 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:09:05,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:05,624 INFO L93 Difference]: Finished difference Result 43 states and 52 transitions. [2023-04-02 22:09:05,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 22:09:05,626 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2023-04-02 22:09:05,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:05,631 INFO L225 Difference]: With dead ends: 43 [2023-04-02 22:09:05,631 INFO L226 Difference]: Without dead ends: 24 [2023-04-02 22:09:05,633 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2023-04-02 22:09:05,638 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 12 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:05,639 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 67 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:09:05,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-04-02 22:09:05,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2023-04-02 22:09:05,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.2) internal successors, (18), 16 states have internal predecessors, (18), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 22:09:05,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2023-04-02 22:09:05,667 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 12 [2023-04-02 22:09:05,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:05,668 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2023-04-02 22:09:05,668 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 6 states have internal predecessors, (8), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:09:05,669 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2023-04-02 22:09:05,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-04-02 22:09:05,669 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:05,669 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:05,670 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 22:09:05,670 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:05,674 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:05,674 INFO L85 PathProgramCache]: Analyzing trace with hash -2014309146, now seen corresponding path program 1 times [2023-04-02 22:09:05,674 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:05,674 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [92516329] [2023-04-02 22:09:05,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:05,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:05,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:05,830 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:09:05,831 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:05,831 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [92516329] [2023-04-02 22:09:05,831 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [92516329] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:05,831 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991099112] [2023-04-02 22:09:05,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:05,832 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:05,832 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:05,834 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:05,840 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 22:09:05,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:05,898 INFO L262 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 22:09:05,901 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:06,025 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:09:06,026 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:06,207 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:09:06,210 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991099112] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:06,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [901542288] [2023-04-02 22:09:06,224 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 22:09:06,224 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:06,226 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:06,230 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:06,230 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:06,281 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:06,448 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 64 for LOIs [2023-04-02 22:09:06,507 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:06,511 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:09:06,934 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '217#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:09:06,934 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:09:06,934 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:09:06,934 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 15 [2023-04-02 22:09:06,935 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009483357] [2023-04-02 22:09:06,935 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:09:06,935 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-04-02 22:09:06,935 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:06,936 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-04-02 22:09:06,937 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=517, Unknown=0, NotChecked=0, Total=600 [2023-04-02 22:09:06,937 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:09:07,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:07,144 INFO L93 Difference]: Finished difference Result 47 states and 55 transitions. [2023-04-02 22:09:07,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2023-04-02 22:09:07,145 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-04-02 22:09:07,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:07,146 INFO L225 Difference]: With dead ends: 47 [2023-04-02 22:09:07,146 INFO L226 Difference]: Without dead ends: 45 [2023-04-02 22:09:07,147 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=148, Invalid=908, Unknown=0, NotChecked=0, Total=1056 [2023-04-02 22:09:07,148 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 23 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:07,148 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 62 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:09:07,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-04-02 22:09:07,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 34. [2023-04-02 22:09:07,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 25 states have internal predecessors, (28), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 22:09:07,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2023-04-02 22:09:07,156 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 13 [2023-04-02 22:09:07,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:07,156 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2023-04-02 22:09:07,156 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 13 states have internal predecessors, (19), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:09:07,156 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2023-04-02 22:09:07,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-02 22:09:07,157 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:07,157 INFO L195 NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:07,164 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 22:09:07,371 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:07,371 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:07,371 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:07,372 INFO L85 PathProgramCache]: Analyzing trace with hash 879148006, now seen corresponding path program 2 times [2023-04-02 22:09:07,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:07,372 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072749760] [2023-04-02 22:09:07,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:07,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:07,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:07,488 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:09:07,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:07,490 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072749760] [2023-04-02 22:09:07,490 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072749760] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:07,491 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403204379] [2023-04-02 22:09:07,491 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:09:07,491 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:07,491 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:07,493 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:07,516 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 22:09:07,526 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 22:09:07,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:09:07,527 INFO L262 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 14 conjunts are in the unsatisfiable core [2023-04-02 22:09:07,528 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:07,581 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:09:07,581 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:07,637 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:09:07,637 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403204379] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:07,637 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1153579752] [2023-04-02 22:09:07,641 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 22:09:07,641 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:07,641 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:07,642 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:07,642 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:07,661 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:07,747 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 64 for LOIs [2023-04-02 22:09:07,786 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:07,789 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:09:08,199 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '472#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:09:08,200 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:09:08,200 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:09:08,200 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 17 [2023-04-02 22:09:08,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682639266] [2023-04-02 22:09:08,200 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:09:08,200 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-02 22:09:08,200 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:08,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-02 22:09:08,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=603, Unknown=0, NotChecked=0, Total=702 [2023-04-02 22:09:08,201 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 15 states have internal predecessors, (23), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:09:08,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:08,418 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2023-04-02 22:09:08,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-02 22:09:08,419 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 15 states have internal predecessors, (23), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2023-04-02 22:09:08,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:08,420 INFO L225 Difference]: With dead ends: 63 [2023-04-02 22:09:08,420 INFO L226 Difference]: Without dead ends: 61 [2023-04-02 22:09:08,421 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=155, Invalid=901, Unknown=0, NotChecked=0, Total=1056 [2023-04-02 22:09:08,422 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 25 mSDsluCounter, 112 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:08,422 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 129 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 293 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:09:08,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2023-04-02 22:09:08,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 34. [2023-04-02 22:09:08,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.2173913043478262) internal successors, (28), 25 states have internal predecessors, (28), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 22:09:08,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2023-04-02 22:09:08,428 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 15 [2023-04-02 22:09:08,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:08,428 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2023-04-02 22:09:08,428 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 15 states have internal predecessors, (23), 3 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 22:09:08,429 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2023-04-02 22:09:08,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-02 22:09:08,429 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:08,429 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:08,435 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 22:09:08,634 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-02 22:09:08,634 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:08,634 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:08,634 INFO L85 PathProgramCache]: Analyzing trace with hash -1336760423, now seen corresponding path program 1 times [2023-04-02 22:09:08,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:08,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503377640] [2023-04-02 22:09:08,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:08,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:08,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:08,691 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:09:08,691 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:08,691 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503377640] [2023-04-02 22:09:08,692 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [503377640] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:08,692 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2054399716] [2023-04-02 22:09:08,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:08,692 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:08,692 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:08,698 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:08,699 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 22:09:08,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:08,726 INFO L262 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 5 conjunts are in the unsatisfiable core [2023-04-02 22:09:08,727 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:08,758 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:09:08,758 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 22:09:08,759 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2054399716] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:09:08,759 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:09:08,759 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2023-04-02 22:09:08,759 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136315599] [2023-04-02 22:09:08,759 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:09:08,760 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 22:09:08,761 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:08,761 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 22:09:08,761 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2023-04-02 22:09:08,761 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:09:08,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:08,783 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2023-04-02 22:09:08,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 22:09:08,783 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2023-04-02 22:09:08,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:08,784 INFO L225 Difference]: With dead ends: 49 [2023-04-02 22:09:08,784 INFO L226 Difference]: Without dead ends: 34 [2023-04-02 22:09:08,785 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2023-04-02 22:09:08,786 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:08,787 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 46 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:09:08,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-04-02 22:09:08,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2023-04-02 22:09:08,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.173913043478261) internal successors, (27), 25 states have internal predecessors, (27), 6 states have call successors, (6), 5 states have call predecessors, (6), 4 states have return successors, (5), 3 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 22:09:08,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2023-04-02 22:09:08,796 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 19 [2023-04-02 22:09:08,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:08,796 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2023-04-02 22:09:08,796 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:09:08,796 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2023-04-02 22:09:08,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 22:09:08,797 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:08,797 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:08,804 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 22:09:09,001 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:09,002 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:09,002 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:09,002 INFO L85 PathProgramCache]: Analyzing trace with hash -588247399, now seen corresponding path program 1 times [2023-04-02 22:09:09,002 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:09,002 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1959892230] [2023-04-02 22:09:09,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:09,003 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:09,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:09,145 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:09:09,145 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:09,145 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1959892230] [2023-04-02 22:09:09,146 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1959892230] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:09,146 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365904687] [2023-04-02 22:09:09,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:09,146 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:09,146 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:09,147 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:09,149 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 22:09:09,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:09,177 INFO L262 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-02 22:09:09,178 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:09,269 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:09:09,270 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:09,436 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 22:09:09,436 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1365904687] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:09,436 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [562347754] [2023-04-02 22:09:09,437 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:09:09,437 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:09,438 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:09,438 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:09,438 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:09,452 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:09,730 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:09:09,742 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:09,744 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:09:10,448 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '979#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:09:10,448 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:09:10,449 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:09:10,449 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 21 [2023-04-02 22:09:10,449 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541417007] [2023-04-02 22:09:10,449 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:09:10,449 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 22:09:10,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:10,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 22:09:10,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=923, Unknown=0, NotChecked=0, Total=1056 [2023-04-02 22:09:10,450 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 21 states, 20 states have (on average 1.5) internal successors, (30), 19 states have internal predecessors, (30), 5 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 22:09:10,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:10,817 INFO L93 Difference]: Finished difference Result 65 states and 75 transitions. [2023-04-02 22:09:10,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-04-02 22:09:10,817 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 1.5) internal successors, (30), 19 states have internal predecessors, (30), 5 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 21 [2023-04-02 22:09:10,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:10,818 INFO L225 Difference]: With dead ends: 65 [2023-04-02 22:09:10,818 INFO L226 Difference]: Without dead ends: 40 [2023-04-02 22:09:10,819 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 495 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=250, Invalid=1730, Unknown=0, NotChecked=0, Total=1980 [2023-04-02 22:09:10,819 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 33 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:10,819 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 69 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:09:10,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-04-02 22:09:10,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2023-04-02 22:09:10,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 27 states have (on average 1.1481481481481481) internal successors, (31), 29 states have internal predecessors, (31), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 22:09:10,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 44 transitions. [2023-04-02 22:09:10,825 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 44 transitions. Word has length 21 [2023-04-02 22:09:10,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:10,825 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 44 transitions. [2023-04-02 22:09:10,825 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 1.5) internal successors, (30), 19 states have internal predecessors, (30), 5 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-04-02 22:09:10,825 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 44 transitions. [2023-04-02 22:09:10,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-04-02 22:09:10,826 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:10,826 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:10,832 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 22:09:11,030 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:11,030 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:11,031 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:11,031 INFO L85 PathProgramCache]: Analyzing trace with hash 1626606982, now seen corresponding path program 2 times [2023-04-02 22:09:11,031 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:11,031 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [201855263] [2023-04-02 22:09:11,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:11,031 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:11,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:11,364 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:09:11,364 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:11,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [201855263] [2023-04-02 22:09:11,365 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [201855263] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:11,365 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1719804971] [2023-04-02 22:09:11,365 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:09:11,365 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:11,365 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:11,373 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:11,375 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-04-02 22:09:11,416 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 22:09:11,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:09:11,417 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 18 conjunts are in the unsatisfiable core [2023-04-02 22:09:11,419 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:11,582 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:09:11,582 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:11,844 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:09:11,844 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1719804971] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:11,844 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1913916940] [2023-04-02 22:09:11,845 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:09:11,846 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:11,846 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:11,846 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:11,846 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:11,863 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:12,120 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:09:12,133 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:12,135 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:09:12,869 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1377#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:09:12,869 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:09:12,869 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:09:12,869 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 29 [2023-04-02 22:09:12,869 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122171517] [2023-04-02 22:09:12,869 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:09:12,870 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-04-02 22:09:12,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:12,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-04-02 22:09:12,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=1467, Unknown=0, NotChecked=0, Total=1640 [2023-04-02 22:09:12,871 INFO L87 Difference]: Start difference. First operand 39 states and 44 transitions. Second operand has 29 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 27 states have internal predecessors, (40), 8 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-02 22:09:13,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:13,131 INFO L93 Difference]: Finished difference Result 65 states and 71 transitions. [2023-04-02 22:09:13,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-04-02 22:09:13,132 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 27 states have internal predecessors, (40), 8 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) Word has length 29 [2023-04-02 22:09:13,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:13,132 INFO L225 Difference]: With dead ends: 65 [2023-04-02 22:09:13,132 INFO L226 Difference]: Without dead ends: 43 [2023-04-02 22:09:13,133 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 622 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=244, Invalid=2108, Unknown=0, NotChecked=0, Total=2352 [2023-04-02 22:09:13,134 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 15 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 335 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:13,134 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 108 Invalid, 335 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:09:13,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-04-02 22:09:13,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2023-04-02 22:09:13,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 30 states have (on average 1.1) internal successors, (33), 32 states have internal predecessors, (33), 7 states have call successors, (7), 6 states have call predecessors, (7), 5 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-04-02 22:09:13,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2023-04-02 22:09:13,139 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 29 [2023-04-02 22:09:13,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:13,139 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2023-04-02 22:09:13,139 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 1.4285714285714286) internal successors, (40), 27 states have internal predecessors, (40), 8 states have call successors, (10), 3 states have call predecessors, (10), 1 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-02 22:09:13,139 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2023-04-02 22:09:13,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-04-02 22:09:13,140 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:13,140 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:13,147 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-04-02 22:09:13,346 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:13,347 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:13,347 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:13,347 INFO L85 PathProgramCache]: Analyzing trace with hash 930501310, now seen corresponding path program 3 times [2023-04-02 22:09:13,347 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:13,347 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879915773] [2023-04-02 22:09:13,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:13,348 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:13,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:13,484 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 7 proven. 14 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:09:13,484 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:13,484 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879915773] [2023-04-02 22:09:13,484 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1879915773] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:13,484 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621331143] [2023-04-02 22:09:13,484 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:09:13,485 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:13,485 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:13,485 INFO L229 MonitoredProcess]: Starting monitored process 7 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:13,487 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-04-02 22:09:13,524 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:09:13,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:09:13,525 INFO L262 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 18 conjunts are in the unsatisfiable core [2023-04-02 22:09:13,528 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:13,601 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:09:13,601 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:13,683 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 22:09:13,683 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621331143] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:13,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1711247706] [2023-04-02 22:09:13,685 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:09:13,686 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:13,686 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:13,686 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:13,686 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:13,699 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:13,943 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:09:13,954 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:13,956 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:09:14,588 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1769#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:09:14,589 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:09:14,589 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:09:14,589 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 21 [2023-04-02 22:09:14,589 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [881950761] [2023-04-02 22:09:14,589 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:09:14,589 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-04-02 22:09:14,589 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:14,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-04-02 22:09:14,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=917, Unknown=0, NotChecked=0, Total=1056 [2023-04-02 22:09:14,590 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand has 21 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 19 states have internal predecessors, (31), 4 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 22:09:14,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:14,730 INFO L93 Difference]: Finished difference Result 56 states and 60 transitions. [2023-04-02 22:09:14,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-02 22:09:14,731 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 19 states have internal predecessors, (31), 4 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 30 [2023-04-02 22:09:14,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:14,732 INFO L225 Difference]: With dead ends: 56 [2023-04-02 22:09:14,732 INFO L226 Difference]: Without dead ends: 54 [2023-04-02 22:09:14,733 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 66 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=201, Invalid=1281, Unknown=0, NotChecked=0, Total=1482 [2023-04-02 22:09:14,733 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 20 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:14,733 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 68 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:09:14,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2023-04-02 22:09:14,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50. [2023-04-02 22:09:14,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 37 states have internal predecessors, (38), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 5 states have call predecessors, (7), 7 states have call successors, (7) [2023-04-02 22:09:14,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2023-04-02 22:09:14,739 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 30 [2023-04-02 22:09:14,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:14,739 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2023-04-02 22:09:14,740 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.4761904761904763) internal successors, (31), 19 states have internal predecessors, (31), 4 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 22:09:14,740 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2023-04-02 22:09:14,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-04-02 22:09:14,740 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:14,740 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:14,748 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-04-02 22:09:14,944 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:14,945 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:14,946 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:14,946 INFO L85 PathProgramCache]: Analyzing trace with hash -1390374407, now seen corresponding path program 4 times [2023-04-02 22:09:14,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:14,946 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1188026336] [2023-04-02 22:09:14,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:14,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:14,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:15,194 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 11 proven. 20 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 22:09:15,194 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:15,194 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1188026336] [2023-04-02 22:09:15,195 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1188026336] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:15,195 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [934498522] [2023-04-02 22:09:15,195 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:09:15,195 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:15,195 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:15,196 INFO L229 MonitoredProcess]: Starting monitored process 8 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:15,196 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-04-02 22:09:15,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:15,232 INFO L262 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-02 22:09:15,233 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:15,385 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 6 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 22:09:15,385 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:15,735 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 6 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 22:09:15,735 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [934498522] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:15,736 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1692223890] [2023-04-02 22:09:15,737 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:09:15,737 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:15,737 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:15,737 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:15,737 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:15,745 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:15,977 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:09:15,986 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:15,988 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:09:16,713 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2205#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:09:16,713 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:09:16,713 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:09:16,713 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 31 [2023-04-02 22:09:16,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082455855] [2023-04-02 22:09:16,713 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:09:16,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-04-02 22:09:16,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:16,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-04-02 22:09:16,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1598, Unknown=0, NotChecked=0, Total=1806 [2023-04-02 22:09:16,715 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand has 31 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 29 states have internal predecessors, (46), 11 states have call successors, (13), 3 states have call predecessors, (13), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 22:09:17,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:17,299 INFO L93 Difference]: Finished difference Result 93 states and 105 transitions. [2023-04-02 22:09:17,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-04-02 22:09:17,300 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 29 states have internal predecessors, (46), 11 states have call successors, (13), 3 states have call predecessors, (13), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 37 [2023-04-02 22:09:17,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:17,300 INFO L225 Difference]: With dead ends: 93 [2023-04-02 22:09:17,300 INFO L226 Difference]: Without dead ends: 64 [2023-04-02 22:09:17,301 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 83 SyntacticMatches, 1 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 815 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=374, Invalid=2706, Unknown=0, NotChecked=0, Total=3080 [2023-04-02 22:09:17,302 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 48 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 425 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:17,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 118 Invalid, 471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 425 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:09:17,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-04-02 22:09:17,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2023-04-02 22:09:17,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 44 states have (on average 1.1363636363636365) internal successors, (50), 47 states have internal predecessors, (50), 11 states have call successors, (11), 7 states have call predecessors, (11), 6 states have return successors, (10), 7 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 22:09:17,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 71 transitions. [2023-04-02 22:09:17,310 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 71 transitions. Word has length 37 [2023-04-02 22:09:17,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:17,310 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 71 transitions. [2023-04-02 22:09:17,310 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 29 states have internal predecessors, (46), 11 states have call successors, (13), 3 states have call predecessors, (13), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 22:09:17,310 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 71 transitions. [2023-04-02 22:09:17,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2023-04-02 22:09:17,311 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:17,311 INFO L195 NwaCegarLoop]: trace histogram [9, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:17,316 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-04-02 22:09:17,516 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:17,516 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:17,516 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:17,516 INFO L85 PathProgramCache]: Analyzing trace with hash 1101156657, now seen corresponding path program 5 times [2023-04-02 22:09:17,517 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:17,517 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623045693] [2023-04-02 22:09:17,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:17,517 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:17,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:17,696 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 34 proven. 32 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-02 22:09:17,696 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:17,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623045693] [2023-04-02 22:09:17,696 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [623045693] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:17,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [649976316] [2023-04-02 22:09:17,696 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:09:17,696 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:17,696 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:17,697 INFO L229 MonitoredProcess]: Starting monitored process 9 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:17,698 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-04-02 22:09:17,750 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-04-02 22:09:17,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:09:17,751 INFO L262 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 34 conjunts are in the unsatisfiable core [2023-04-02 22:09:17,755 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:17,986 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 11 proven. 61 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:09:17,986 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:18,252 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 11 proven. 61 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-02 22:09:18,252 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [649976316] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:18,252 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [756671058] [2023-04-02 22:09:18,254 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:09:18,254 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:18,254 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:18,254 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:18,254 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:18,263 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:18,494 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:09:18,504 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:18,506 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:09:19,284 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2778#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:09:19,284 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:09:19,284 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:09:19,285 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 19, 19] total 44 [2023-04-02 22:09:19,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445753311] [2023-04-02 22:09:19,285 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:09:19,285 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2023-04-02 22:09:19,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:19,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2023-04-02 22:09:19,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=428, Invalid=2652, Unknown=0, NotChecked=0, Total=3080 [2023-04-02 22:09:19,286 INFO L87 Difference]: Start difference. First operand 62 states and 71 transitions. Second operand has 44 states, 44 states have (on average 1.3863636363636365) internal successors, (61), 42 states have internal predecessors, (61), 9 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2023-04-02 22:09:19,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:19,983 INFO L93 Difference]: Finished difference Result 130 states and 159 transitions. [2023-04-02 22:09:19,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-04-02 22:09:19,984 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.3863636363636365) internal successors, (61), 42 states have internal predecessors, (61), 9 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) Word has length 42 [2023-04-02 22:09:19,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:19,985 INFO L225 Difference]: With dead ends: 130 [2023-04-02 22:09:19,985 INFO L226 Difference]: Without dead ends: 128 [2023-04-02 22:09:19,986 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2014 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1099, Invalid=5381, Unknown=0, NotChecked=0, Total=6480 [2023-04-02 22:09:19,987 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 73 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 722 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 107 SdHoareTripleChecker+Invalid, 817 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 722 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:19,987 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 107 Invalid, 817 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 722 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 22:09:19,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2023-04-02 22:09:20,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 112. [2023-04-02 22:09:20,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 77 states have (on average 1.077922077922078) internal successors, (83), 82 states have internal predecessors, (83), 27 states have call successors, (27), 8 states have call predecessors, (27), 7 states have return successors, (26), 21 states have call predecessors, (26), 26 states have call successors, (26) [2023-04-02 22:09:20,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 136 transitions. [2023-04-02 22:09:20,003 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 136 transitions. Word has length 42 [2023-04-02 22:09:20,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:20,004 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 136 transitions. [2023-04-02 22:09:20,004 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.3863636363636365) internal successors, (61), 42 states have internal predecessors, (61), 9 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (8), 7 states have call predecessors, (8), 7 states have call successors, (8) [2023-04-02 22:09:20,004 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 136 transitions. [2023-04-02 22:09:20,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-04-02 22:09:20,005 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:20,005 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:20,018 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-04-02 22:09:20,209 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-04-02 22:09:20,209 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:20,209 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:20,209 INFO L85 PathProgramCache]: Analyzing trace with hash 2098884134, now seen corresponding path program 6 times [2023-04-02 22:09:20,210 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:20,210 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536780880] [2023-04-02 22:09:20,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:20,210 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:20,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:20,527 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 20 proven. 29 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-02 22:09:20,527 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:20,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536780880] [2023-04-02 22:09:20,527 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [536780880] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:20,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172688226] [2023-04-02 22:09:20,527 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:09:20,527 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:20,528 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:20,528 INFO L229 MonitoredProcess]: Starting monitored process 10 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:20,557 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-04-02 22:09:20,611 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:09:20,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:09:20,612 INFO L262 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 28 conjunts are in the unsatisfiable core [2023-04-02 22:09:20,613 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:20,809 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 8 proven. 41 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-02 22:09:20,809 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:21,232 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 8 proven. 41 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-04-02 22:09:21,233 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [172688226] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:21,233 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [883663279] [2023-04-02 22:09:21,234 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:09:21,234 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:21,234 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:21,234 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:21,234 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:21,245 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:21,482 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:09:21,493 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:21,496 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:09:22,269 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3535#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:09:22,269 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:09:22,269 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:09:22,269 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 36 [2023-04-02 22:09:22,269 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126944820] [2023-04-02 22:09:22,269 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:09:22,270 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2023-04-02 22:09:22,270 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:22,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2023-04-02 22:09:22,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=256, Invalid=2000, Unknown=0, NotChecked=0, Total=2256 [2023-04-02 22:09:22,271 INFO L87 Difference]: Start difference. First operand 112 states and 136 transitions. Second operand has 36 states, 35 states have (on average 1.542857142857143) internal successors, (54), 34 states have internal predecessors, (54), 14 states have call successors, (16), 3 states have call predecessors, (16), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-04-02 22:09:23,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:23,066 INFO L93 Difference]: Finished difference Result 170 states and 201 transitions. [2023-04-02 22:09:23,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2023-04-02 22:09:23,066 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.542857142857143) internal successors, (54), 34 states have internal predecessors, (54), 14 states have call successors, (16), 3 states have call predecessors, (16), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 45 [2023-04-02 22:09:23,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:23,067 INFO L225 Difference]: With dead ends: 170 [2023-04-02 22:09:23,067 INFO L226 Difference]: Without dead ends: 134 [2023-04-02 22:09:23,068 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1051 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=478, Invalid=3428, Unknown=0, NotChecked=0, Total=3906 [2023-04-02 22:09:23,069 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 55 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 626 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 626 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:23,069 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 119 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 626 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 22:09:23,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2023-04-02 22:09:23,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 130. [2023-04-02 22:09:23,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 90 states have (on average 1.0777777777777777) internal successors, (97), 95 states have internal predecessors, (97), 31 states have call successors, (31), 9 states have call predecessors, (31), 8 states have return successors, (30), 25 states have call predecessors, (30), 30 states have call successors, (30) [2023-04-02 22:09:23,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 158 transitions. [2023-04-02 22:09:23,089 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 158 transitions. Word has length 45 [2023-04-02 22:09:23,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:23,089 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 158 transitions. [2023-04-02 22:09:23,090 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 1.542857142857143) internal successors, (54), 34 states have internal predecessors, (54), 14 states have call successors, (16), 3 states have call predecessors, (16), 1 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-04-02 22:09:23,090 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 158 transitions. [2023-04-02 22:09:23,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-04-02 22:09:23,095 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:23,096 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:23,100 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-04-02 22:09:23,300 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-04-02 22:09:23,300 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:23,300 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:23,300 INFO L85 PathProgramCache]: Analyzing trace with hash -45503143, now seen corresponding path program 7 times [2023-04-02 22:09:23,301 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:23,301 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [946548304] [2023-04-02 22:09:23,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:23,301 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:23,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:23,680 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 32 proven. 39 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-04-02 22:09:23,680 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:23,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [946548304] [2023-04-02 22:09:23,680 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [946548304] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:23,680 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [681166164] [2023-04-02 22:09:23,680 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:09:23,680 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:23,680 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:23,681 INFO L229 MonitoredProcess]: Starting monitored process 11 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:23,684 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-04-02 22:09:23,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:23,714 INFO L262 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 32 conjunts are in the unsatisfiable core [2023-04-02 22:09:23,715 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:23,939 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 10 proven. 61 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-04-02 22:09:23,939 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:24,455 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 10 proven. 61 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-04-02 22:09:24,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [681166164] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:24,455 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1303871292] [2023-04-02 22:09:24,457 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:09:24,457 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:24,457 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:24,457 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:24,457 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:24,470 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:24,695 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:09:24,706 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:24,708 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:09:25,540 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4411#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:09:25,540 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:09:25,540 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:09:25,540 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 41 [2023-04-02 22:09:25,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580517544] [2023-04-02 22:09:25,540 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:09:25,541 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2023-04-02 22:09:25,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:25,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2023-04-02 22:09:25,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=2445, Unknown=0, NotChecked=0, Total=2756 [2023-04-02 22:09:25,542 INFO L87 Difference]: Start difference. First operand 130 states and 158 transitions. Second operand has 41 states, 40 states have (on average 1.55) internal successors, (62), 39 states have internal predecessors, (62), 17 states have call successors, (19), 3 states have call predecessors, (19), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:09:26,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:26,552 INFO L93 Difference]: Finished difference Result 191 states and 225 transitions. [2023-04-02 22:09:26,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2023-04-02 22:09:26,552 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 1.55) internal successors, (62), 39 states have internal predecessors, (62), 17 states have call successors, (19), 3 states have call predecessors, (19), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) Word has length 53 [2023-04-02 22:09:26,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:26,553 INFO L225 Difference]: With dead ends: 191 [2023-04-02 22:09:26,553 INFO L226 Difference]: Without dead ends: 148 [2023-04-02 22:09:26,554 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 125 SyntacticMatches, 1 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1314 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=598, Invalid=4232, Unknown=0, NotChecked=0, Total=4830 [2023-04-02 22:09:26,555 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 65 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 838 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 911 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 838 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:26,555 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 141 Invalid, 911 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 838 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 22:09:26,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2023-04-02 22:09:26,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 145. [2023-04-02 22:09:26,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 101 states have (on average 1.0792079207920793) internal successors, (109), 106 states have internal predecessors, (109), 34 states have call successors, (34), 10 states have call predecessors, (34), 9 states have return successors, (33), 28 states have call predecessors, (33), 33 states have call successors, (33) [2023-04-02 22:09:26,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 176 transitions. [2023-04-02 22:09:26,581 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 176 transitions. Word has length 53 [2023-04-02 22:09:26,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:26,582 INFO L495 AbstractCegarLoop]: Abstraction has 145 states and 176 transitions. [2023-04-02 22:09:26,582 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 1.55) internal successors, (62), 39 states have internal predecessors, (62), 17 states have call successors, (19), 3 states have call predecessors, (19), 1 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:09:26,582 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 176 transitions. [2023-04-02 22:09:26,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2023-04-02 22:09:26,583 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:26,583 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:26,590 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-04-02 22:09:26,788 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-04-02 22:09:26,788 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:26,788 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:26,789 INFO L85 PathProgramCache]: Analyzing trace with hash -133351738, now seen corresponding path program 8 times [2023-04-02 22:09:26,789 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:26,789 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086630376] [2023-04-02 22:09:26,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:26,789 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:26,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:27,227 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 47 proven. 50 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 22:09:27,228 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:27,228 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086630376] [2023-04-02 22:09:27,228 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2086630376] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:27,228 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908296494] [2023-04-02 22:09:27,228 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:09:27,228 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:27,228 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:27,229 INFO L229 MonitoredProcess]: Starting monitored process 12 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:27,235 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-04-02 22:09:27,276 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-04-02 22:09:27,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:09:27,277 INFO L262 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 30 conjunts are in the unsatisfiable core [2023-04-02 22:09:27,278 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:27,702 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 12 proven. 85 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 22:09:27,703 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:28,379 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 12 proven. 85 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 22:09:28,379 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [908296494] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:28,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [454863096] [2023-04-02 22:09:28,380 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:09:28,381 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:28,381 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:28,381 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:28,381 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:28,423 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:28,643 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:09:28,653 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:28,655 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:09:29,528 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5408#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:09:29,528 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:09:29,528 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:09:29,528 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20, 20] total 53 [2023-04-02 22:09:29,528 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132195513] [2023-04-02 22:09:29,528 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:09:29,529 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2023-04-02 22:09:29,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:29,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2023-04-02 22:09:29,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=393, Invalid=3767, Unknown=0, NotChecked=0, Total=4160 [2023-04-02 22:09:29,530 INFO L87 Difference]: Start difference. First operand 145 states and 176 transitions. Second operand has 53 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 51 states have internal predecessors, (76), 20 states have call successors, (22), 3 states have call predecessors, (22), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2023-04-02 22:09:30,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:30,662 INFO L93 Difference]: Finished difference Result 178 states and 205 transitions. [2023-04-02 22:09:30,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-04-02 22:09:30,662 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 51 states have internal predecessors, (76), 20 states have call successors, (22), 3 states have call predecessors, (22), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) Word has length 61 [2023-04-02 22:09:30,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:30,663 INFO L225 Difference]: With dead ends: 178 [2023-04-02 22:09:30,663 INFO L226 Difference]: Without dead ends: 128 [2023-04-02 22:09:30,665 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 139 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=697, Invalid=6613, Unknown=0, NotChecked=0, Total=7310 [2023-04-02 22:09:30,665 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 18 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 810 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 848 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 810 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:30,665 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 146 Invalid, 848 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 810 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 22:09:30,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2023-04-02 22:09:30,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2023-04-02 22:09:30,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 90 states have (on average 1.0777777777777777) internal successors, (97), 94 states have internal predecessors, (97), 28 states have call successors, (28), 10 states have call predecessors, (28), 9 states have return successors, (27), 23 states have call predecessors, (27), 27 states have call successors, (27) [2023-04-02 22:09:30,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 152 transitions. [2023-04-02 22:09:30,684 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 152 transitions. Word has length 61 [2023-04-02 22:09:30,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:30,684 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 152 transitions. [2023-04-02 22:09:30,684 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 52 states have (on average 1.4615384615384615) internal successors, (76), 51 states have internal predecessors, (76), 20 states have call successors, (22), 3 states have call predecessors, (22), 1 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2023-04-02 22:09:30,684 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 152 transitions. [2023-04-02 22:09:30,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2023-04-02 22:09:30,685 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:30,685 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:30,689 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-04-02 22:09:30,889 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-04-02 22:09:30,889 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:30,889 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:30,889 INFO L85 PathProgramCache]: Analyzing trace with hash -561946439, now seen corresponding path program 9 times [2023-04-02 22:09:30,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:30,890 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1816427955] [2023-04-02 22:09:30,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:30,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:30,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:31,408 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 65 proven. 62 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-04-02 22:09:31,408 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:31,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1816427955] [2023-04-02 22:09:31,408 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1816427955] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:31,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [775281489] [2023-04-02 22:09:31,408 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:09:31,408 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:31,409 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:31,409 INFO L229 MonitoredProcess]: Starting monitored process 13 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:31,411 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-04-02 22:09:31,450 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:09:31,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:09:31,451 INFO L262 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 40 conjunts are in the unsatisfiable core [2023-04-02 22:09:31,453 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:31,836 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 14 proven. 113 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-04-02 22:09:31,836 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:32,582 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 14 proven. 113 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-04-02 22:09:32,582 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [775281489] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:32,582 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [465834997] [2023-04-02 22:09:32,583 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:09:32,583 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:32,583 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:32,584 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:32,584 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:32,591 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:32,796 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:09:32,810 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:32,812 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:09:33,726 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6408#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:09:33,727 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:09:33,727 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:09:33,727 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 51 [2023-04-02 22:09:33,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955410779] [2023-04-02 22:09:33,727 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:09:33,727 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2023-04-02 22:09:33,727 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:33,728 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2023-04-02 22:09:33,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=442, Invalid=3464, Unknown=0, NotChecked=0, Total=3906 [2023-04-02 22:09:33,729 INFO L87 Difference]: Start difference. First operand 128 states and 152 transitions. Second operand has 51 states, 50 states have (on average 1.56) internal successors, (78), 49 states have internal predecessors, (78), 23 states have call successors, (25), 3 states have call predecessors, (25), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2023-04-02 22:09:35,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:35,188 INFO L93 Difference]: Finished difference Result 195 states and 229 transitions. [2023-04-02 22:09:35,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2023-04-02 22:09:35,189 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 1.56) internal successors, (78), 49 states have internal predecessors, (78), 23 states have call successors, (25), 3 states have call predecessors, (25), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) Word has length 69 [2023-04-02 22:09:35,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:35,189 INFO L225 Difference]: With dead ends: 195 [2023-04-02 22:09:35,189 INFO L226 Difference]: Without dead ends: 142 [2023-04-02 22:09:35,191 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 167 SyntacticMatches, 1 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1921 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=886, Invalid=6086, Unknown=0, NotChecked=0, Total=6972 [2023-04-02 22:09:35,191 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 91 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 1164 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 1278 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 1164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:35,191 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [92 Valid, 155 Invalid, 1278 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 1164 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-02 22:09:35,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2023-04-02 22:09:35,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 140. [2023-04-02 22:09:35,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 99 states have (on average 1.101010101010101) internal successors, (109), 104 states have internal predecessors, (109), 31 states have call successors, (31), 10 states have call predecessors, (31), 9 states have return successors, (30), 25 states have call predecessors, (30), 30 states have call successors, (30) [2023-04-02 22:09:35,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 170 transitions. [2023-04-02 22:09:35,211 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 170 transitions. Word has length 69 [2023-04-02 22:09:35,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:35,211 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 170 transitions. [2023-04-02 22:09:35,211 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 1.56) internal successors, (78), 49 states have internal predecessors, (78), 23 states have call successors, (25), 3 states have call predecessors, (25), 1 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22) [2023-04-02 22:09:35,212 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 170 transitions. [2023-04-02 22:09:35,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-04-02 22:09:35,212 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:35,212 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:35,216 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-04-02 22:09:35,413 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-04-02 22:09:35,413 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:35,413 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:35,413 INFO L85 PathProgramCache]: Analyzing trace with hash 1006004070, now seen corresponding path program 10 times [2023-04-02 22:09:35,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:35,413 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940423781] [2023-04-02 22:09:35,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:35,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:35,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:35,974 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 86 proven. 75 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-04-02 22:09:35,975 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:35,975 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940423781] [2023-04-02 22:09:35,975 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940423781] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:35,975 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1395510391] [2023-04-02 22:09:35,975 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:09:35,975 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:35,975 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:35,976 INFO L229 MonitoredProcess]: Starting monitored process 14 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:35,976 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-04-02 22:09:36,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:36,019 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 44 conjunts are in the unsatisfiable core [2023-04-02 22:09:36,020 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:36,395 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 16 proven. 145 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-04-02 22:09:36,395 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:37,275 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 16 proven. 145 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-04-02 22:09:37,275 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1395510391] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:37,275 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1501678313] [2023-04-02 22:09:37,276 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:09:37,276 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:37,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:37,276 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:37,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:37,294 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:37,510 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:09:37,519 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:37,521 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:09:38,483 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7512#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:09:38,483 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:09:38,483 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:09:38,483 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24, 24] total 56 [2023-04-02 22:09:38,483 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445232240] [2023-04-02 22:09:38,483 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:09:38,483 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2023-04-02 22:09:38,484 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:38,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2023-04-02 22:09:38,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=518, Invalid=4038, Unknown=0, NotChecked=0, Total=4556 [2023-04-02 22:09:38,485 INFO L87 Difference]: Start difference. First operand 140 states and 170 transitions. Second operand has 56 states, 55 states have (on average 1.5636363636363637) internal successors, (86), 54 states have internal predecessors, (86), 26 states have call successors, (28), 3 states have call predecessors, (28), 1 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2023-04-02 22:09:40,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:40,349 INFO L93 Difference]: Finished difference Result 227 states and 270 transitions. [2023-04-02 22:09:40,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-04-02 22:09:40,349 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 55 states have (on average 1.5636363636363637) internal successors, (86), 54 states have internal predecessors, (86), 26 states have call successors, (28), 3 states have call predecessors, (28), 1 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) Word has length 77 [2023-04-02 22:09:40,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:40,350 INFO L225 Difference]: With dead ends: 227 [2023-04-02 22:09:40,350 INFO L226 Difference]: Without dead ends: 171 [2023-04-02 22:09:40,351 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 188 SyntacticMatches, 1 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2265 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1054, Invalid=7136, Unknown=0, NotChecked=0, Total=8190 [2023-04-02 22:09:40,352 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 102 mSDsluCounter, 157 mSDsCounter, 0 mSdLazyCounter, 1484 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 1617 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 1484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:40,352 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 174 Invalid, 1617 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 1484 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-04-02 22:09:40,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2023-04-02 22:09:40,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2023-04-02 22:09:40,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 120 states have (on average 1.0916666666666666) internal successors, (131), 125 states have internal predecessors, (131), 39 states have call successors, (39), 11 states have call predecessors, (39), 10 states have return successors, (38), 33 states have call predecessors, (38), 38 states have call successors, (38) [2023-04-02 22:09:40,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 208 transitions. [2023-04-02 22:09:40,377 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 208 transitions. Word has length 77 [2023-04-02 22:09:40,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:40,377 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 208 transitions. [2023-04-02 22:09:40,377 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 55 states have (on average 1.5636363636363637) internal successors, (86), 54 states have internal predecessors, (86), 26 states have call successors, (28), 3 states have call predecessors, (28), 1 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2023-04-02 22:09:40,377 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 208 transitions. [2023-04-02 22:09:40,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2023-04-02 22:09:40,378 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:40,378 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:40,383 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2023-04-02 22:09:40,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-04-02 22:09:40,583 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:40,583 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:40,583 INFO L85 PathProgramCache]: Analyzing trace with hash -1017271271, now seen corresponding path program 11 times [2023-04-02 22:09:40,583 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:40,583 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [789419774] [2023-04-02 22:09:40,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:40,583 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:40,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:41,226 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 110 proven. 89 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2023-04-02 22:09:41,226 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:41,226 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [789419774] [2023-04-02 22:09:41,226 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [789419774] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:41,226 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [225860802] [2023-04-02 22:09:41,226 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:09:41,227 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:41,227 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:41,227 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) [2023-04-02 22:09:41,229 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-04-02 22:09:41,284 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2023-04-02 22:09:41,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:09:41,285 INFO L262 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 39 conjunts are in the unsatisfiable core [2023-04-02 22:09:41,287 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:41,939 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 18 proven. 181 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2023-04-02 22:09:41,940 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:43,003 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 18 proven. 181 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2023-04-02 22:09:43,003 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [225860802] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:43,003 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [470783992] [2023-04-02 22:09:43,004 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:09:43,004 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:43,004 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:43,004 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:43,004 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:43,011 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:43,213 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:09:43,223 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:43,224 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:09:44,244 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8785#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:09:44,245 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:09:44,245 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:09:44,245 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 71 [2023-04-02 22:09:44,245 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872738709] [2023-04-02 22:09:44,245 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:09:44,247 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2023-04-02 22:09:44,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:44,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2023-04-02 22:09:44,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=642, Invalid=6164, Unknown=0, NotChecked=0, Total=6806 [2023-04-02 22:09:44,248 INFO L87 Difference]: Start difference. First operand 170 states and 208 transitions. Second operand has 71 states, 70 states have (on average 1.4714285714285715) internal successors, (103), 69 states have internal predecessors, (103), 29 states have call successors, (31), 3 states have call predecessors, (31), 1 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) [2023-04-02 22:09:46,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:46,464 INFO L93 Difference]: Finished difference Result 222 states and 260 transitions. [2023-04-02 22:09:46,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2023-04-02 22:09:46,473 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 70 states have (on average 1.4714285714285715) internal successors, (103), 69 states have internal predecessors, (103), 29 states have call successors, (31), 3 states have call predecessors, (31), 1 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) Word has length 85 [2023-04-02 22:09:46,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:46,474 INFO L225 Difference]: With dead ends: 222 [2023-04-02 22:09:46,474 INFO L226 Difference]: Without dead ends: 155 [2023-04-02 22:09:46,475 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3472 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=1207, Invalid=11449, Unknown=0, NotChecked=0, Total=12656 [2023-04-02 22:09:46,476 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 18 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 1414 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 1501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 1414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:46,476 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 179 Invalid, 1501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 1414 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-02 22:09:46,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2023-04-02 22:09:46,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 154. [2023-04-02 22:09:46,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 109 states have (on average 1.091743119266055) internal successors, (119), 114 states have internal predecessors, (119), 35 states have call successors, (35), 10 states have call predecessors, (35), 9 states have return successors, (34), 29 states have call predecessors, (34), 34 states have call successors, (34) [2023-04-02 22:09:46,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 188 transitions. [2023-04-02 22:09:46,504 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 188 transitions. Word has length 85 [2023-04-02 22:09:46,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:46,504 INFO L495 AbstractCegarLoop]: Abstraction has 154 states and 188 transitions. [2023-04-02 22:09:46,504 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 70 states have (on average 1.4714285714285715) internal successors, (103), 69 states have internal predecessors, (103), 29 states have call successors, (31), 3 states have call predecessors, (31), 1 states have return successors, (28), 28 states have call predecessors, (28), 28 states have call successors, (28) [2023-04-02 22:09:46,504 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 188 transitions. [2023-04-02 22:09:46,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-04-02 22:09:46,505 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:46,505 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:46,512 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-04-02 22:09:46,710 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:46,710 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:46,710 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:46,710 INFO L85 PathProgramCache]: Analyzing trace with hash 1252976977, now seen corresponding path program 12 times [2023-04-02 22:09:46,710 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:46,710 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [877734608] [2023-04-02 22:09:46,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:46,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:46,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:47,031 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 54 proven. 156 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2023-04-02 22:09:47,031 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:47,031 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [877734608] [2023-04-02 22:09:47,032 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [877734608] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:47,032 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [260558547] [2023-04-02 22:09:47,032 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:09:47,032 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:47,032 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:47,033 INFO L229 MonitoredProcess]: Starting monitored process 16 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:47,033 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-04-02 22:09:47,078 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:09:47,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:09:47,079 INFO L262 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 39 conjunts are in the unsatisfiable core [2023-04-02 22:09:47,081 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:47,346 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 18 proven. 192 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2023-04-02 22:09:47,347 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:47,685 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 18 proven. 192 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2023-04-02 22:09:47,685 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [260558547] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:47,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [375160883] [2023-04-02 22:09:47,686 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:09:47,686 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:47,687 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:47,687 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:47,687 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:47,704 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:47,920 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:09:47,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:47,932 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:09:48,774 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10021#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:09:48,774 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:09:48,774 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:09:48,774 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2023-04-02 22:09:48,774 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118691732] [2023-04-02 22:09:48,774 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:09:48,774 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-04-02 22:09:48,774 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:48,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-04-02 22:09:48,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=442, Invalid=3218, Unknown=0, NotChecked=0, Total=3660 [2023-04-02 22:09:48,775 INFO L87 Difference]: Start difference. First operand 154 states and 188 transitions. Second operand has 49 states, 49 states have (on average 1.346938775510204) internal successors, (66), 47 states have internal predecessors, (66), 11 states have call successors, (13), 3 states have call predecessors, (13), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 22:09:49,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:49,277 INFO L93 Difference]: Finished difference Result 167 states and 202 transitions. [2023-04-02 22:09:49,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-04-02 22:09:49,277 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.346938775510204) internal successors, (66), 47 states have internal predecessors, (66), 11 states have call successors, (13), 3 states have call predecessors, (13), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Word has length 86 [2023-04-02 22:09:49,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:49,278 INFO L225 Difference]: With dead ends: 167 [2023-04-02 22:09:49,278 INFO L226 Difference]: Without dead ends: 165 [2023-04-02 22:09:49,279 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 213 SyntacticMatches, 10 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2073 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=905, Invalid=5575, Unknown=0, NotChecked=0, Total=6480 [2023-04-02 22:09:49,279 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 48 mSDsluCounter, 131 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 545 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:49,280 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 140 Invalid, 545 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:09:49,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2023-04-02 22:09:49,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 164. [2023-04-02 22:09:49,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 116 states have (on average 1.0862068965517242) internal successors, (126), 121 states have internal predecessors, (126), 37 states have call successors, (37), 11 states have call predecessors, (37), 10 states have return successors, (36), 31 states have call predecessors, (36), 36 states have call successors, (36) [2023-04-02 22:09:49,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 199 transitions. [2023-04-02 22:09:49,308 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 199 transitions. Word has length 86 [2023-04-02 22:09:49,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:49,309 INFO L495 AbstractCegarLoop]: Abstraction has 164 states and 199 transitions. [2023-04-02 22:09:49,309 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.346938775510204) internal successors, (66), 47 states have internal predecessors, (66), 11 states have call successors, (13), 3 states have call predecessors, (13), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2023-04-02 22:09:49,309 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 199 transitions. [2023-04-02 22:09:49,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2023-04-02 22:09:49,309 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:49,310 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:49,318 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-04-02 22:09:49,514 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-04-02 22:09:49,514 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:49,514 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:49,515 INFO L85 PathProgramCache]: Analyzing trace with hash -1585446906, now seen corresponding path program 13 times [2023-04-02 22:09:49,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:49,515 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1097440183] [2023-04-02 22:09:49,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:49,515 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:49,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:50,259 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 137 proven. 104 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-04-02 22:09:50,260 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:50,260 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1097440183] [2023-04-02 22:09:50,260 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1097440183] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:50,260 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [236966325] [2023-04-02 22:09:50,260 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:09:50,260 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:50,260 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:50,261 INFO L229 MonitoredProcess]: Starting monitored process 17 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:50,261 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-04-02 22:09:50,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:50,308 INFO L262 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 52 conjunts are in the unsatisfiable core [2023-04-02 22:09:50,309 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:50,799 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 20 proven. 221 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-04-02 22:09:50,800 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:51,950 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 20 proven. 221 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-04-02 22:09:51,950 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [236966325] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:51,950 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [851555274] [2023-04-02 22:09:51,951 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:09:51,951 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:51,951 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:51,951 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:51,951 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:51,960 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:52,183 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:09:52,200 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:52,201 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:09:53,264 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11232#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:09:53,264 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:09:53,264 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:09:53,264 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28, 28] total 67 [2023-04-02 22:09:53,265 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931974631] [2023-04-02 22:09:53,265 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:09:53,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2023-04-02 22:09:53,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:09:53,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2023-04-02 22:09:53,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=706, Invalid=5456, Unknown=0, NotChecked=0, Total=6162 [2023-04-02 22:09:53,266 INFO L87 Difference]: Start difference. First operand 164 states and 199 transitions. Second operand has 67 states, 66 states have (on average 1.5606060606060606) internal successors, (103), 65 states have internal predecessors, (103), 32 states have call successors, (34), 3 states have call predecessors, (34), 1 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2023-04-02 22:09:55,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:09:55,857 INFO L93 Difference]: Finished difference Result 269 states and 322 transitions. [2023-04-02 22:09:55,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2023-04-02 22:09:55,857 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 66 states have (on average 1.5606060606060606) internal successors, (103), 65 states have internal predecessors, (103), 32 states have call successors, (34), 3 states have call predecessors, (34), 1 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) Word has length 93 [2023-04-02 22:09:55,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:09:55,860 INFO L225 Difference]: With dead ends: 269 [2023-04-02 22:09:55,860 INFO L226 Difference]: Without dead ends: 203 [2023-04-02 22:09:55,861 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 229 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3084 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=1463, Invalid=9667, Unknown=0, NotChecked=0, Total=11130 [2023-04-02 22:09:55,861 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 138 mSDsluCounter, 190 mSDsCounter, 0 mSdLazyCounter, 2107 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 2303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 2107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-04-02 22:09:55,861 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 209 Invalid, 2303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 2107 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-04-02 22:09:55,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2023-04-02 22:09:55,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 202. [2023-04-02 22:09:55,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 143 states have (on average 1.0909090909090908) internal successors, (156), 148 states have internal predecessors, (156), 47 states have call successors, (47), 12 states have call predecessors, (47), 11 states have return successors, (46), 41 states have call predecessors, (46), 46 states have call successors, (46) [2023-04-02 22:09:55,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 249 transitions. [2023-04-02 22:09:55,903 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 249 transitions. Word has length 93 [2023-04-02 22:09:55,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:09:55,903 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 249 transitions. [2023-04-02 22:09:55,903 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 66 states have (on average 1.5606060606060606) internal successors, (103), 65 states have internal predecessors, (103), 32 states have call successors, (34), 3 states have call predecessors, (34), 1 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2023-04-02 22:09:55,903 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 249 transitions. [2023-04-02 22:09:55,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2023-04-02 22:09:55,904 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:09:55,904 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:09:55,918 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2023-04-02 22:09:56,109 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-04-02 22:09:56,109 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:09:56,109 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:09:56,109 INFO L85 PathProgramCache]: Analyzing trace with hash -537620615, now seen corresponding path program 14 times [2023-04-02 22:09:56,109 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:09:56,109 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59539985] [2023-04-02 22:09:56,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:09:56,109 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:09:56,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:09:56,951 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 167 proven. 120 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2023-04-02 22:09:56,952 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:09:56,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59539985] [2023-04-02 22:09:56,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59539985] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:09:56,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1736720246] [2023-04-02 22:09:56,952 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:09:56,952 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:09:56,952 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:09:56,953 INFO L229 MonitoredProcess]: Starting monitored process 18 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:09:56,954 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-04-02 22:09:57,008 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2023-04-02 22:09:57,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:09:57,010 INFO L262 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 62 conjunts are in the unsatisfiable core [2023-04-02 22:09:57,012 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:09:57,877 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 21 proven. 296 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2023-04-02 22:09:57,878 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:09:59,352 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 21 proven. 296 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2023-04-02 22:09:59,352 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1736720246] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:09:59,353 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1019154149] [2023-04-02 22:09:59,353 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:09:59,354 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:09:59,354 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:09:59,354 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:09:59,354 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:09:59,363 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:09:59,588 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:09:59,598 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:09:59,600 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:10:00,826 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12744#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:10:00,826 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:10:00,826 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:10:00,826 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 32, 32] total 85 [2023-04-02 22:10:00,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687674756] [2023-04-02 22:10:00,827 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:10:00,827 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2023-04-02 22:10:00,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:10:00,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2023-04-02 22:10:00,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1005, Invalid=8307, Unknown=0, NotChecked=0, Total=9312 [2023-04-02 22:10:00,828 INFO L87 Difference]: Start difference. First operand 202 states and 249 transitions. Second operand has 85 states, 84 states have (on average 1.5) internal successors, (126), 83 states have internal predecessors, (126), 35 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2023-04-02 22:10:04,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:10:04,618 INFO L93 Difference]: Finished difference Result 297 states and 358 transitions. [2023-04-02 22:10:04,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2023-04-02 22:10:04,618 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 84 states have (on average 1.5) internal successors, (126), 83 states have internal predecessors, (126), 35 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) Word has length 101 [2023-04-02 22:10:04,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:10:04,620 INFO L225 Difference]: With dead ends: 297 [2023-04-02 22:10:04,620 INFO L226 Difference]: Without dead ends: 224 [2023-04-02 22:10:04,621 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 237 SyntacticMatches, 1 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6035 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=2321, Invalid=16585, Unknown=0, NotChecked=0, Total=18906 [2023-04-02 22:10:04,621 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 161 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 2606 mSolverCounterSat, 238 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 2844 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 238 IncrementalHoareTripleChecker+Valid, 2606 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:10:04,621 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 188 Invalid, 2844 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [238 Valid, 2606 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-04-02 22:10:04,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2023-04-02 22:10:04,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 224. [2023-04-02 22:10:04,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 158 states have (on average 1.0886075949367089) internal successors, (172), 164 states have internal predecessors, (172), 54 states have call successors, (54), 12 states have call predecessors, (54), 11 states have return successors, (53), 47 states have call predecessors, (53), 53 states have call successors, (53) [2023-04-02 22:10:04,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 279 transitions. [2023-04-02 22:10:04,672 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 279 transitions. Word has length 101 [2023-04-02 22:10:04,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:10:04,672 INFO L495 AbstractCegarLoop]: Abstraction has 224 states and 279 transitions. [2023-04-02 22:10:04,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 84 states have (on average 1.5) internal successors, (126), 83 states have internal predecessors, (126), 35 states have call successors, (37), 3 states have call predecessors, (37), 2 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2023-04-02 22:10:04,673 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 279 transitions. [2023-04-02 22:10:04,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2023-04-02 22:10:04,675 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:10:04,675 INFO L195 NwaCegarLoop]: trace histogram [23, 11, 11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:10:04,681 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2023-04-02 22:10:04,879 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-04-02 22:10:04,879 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:10:04,880 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:10:04,880 INFO L85 PathProgramCache]: Analyzing trace with hash 206940678, now seen corresponding path program 15 times [2023-04-02 22:10:04,880 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:10:04,880 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109036284] [2023-04-02 22:10:04,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:10:04,880 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:10:04,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:10:05,651 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 230 proven. 221 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-04-02 22:10:05,651 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:10:05,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109036284] [2023-04-02 22:10:05,651 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1109036284] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:10:05,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [197470109] [2023-04-02 22:10:05,651 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:10:05,651 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:10:05,651 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:10:05,652 INFO L229 MonitoredProcess]: Starting monitored process 19 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:10:05,654 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-04-02 22:10:05,714 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:10:05,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:10:05,716 INFO L262 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 64 conjunts are in the unsatisfiable core [2023-04-02 22:10:05,718 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:10:06,460 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 20 proven. 431 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-04-02 22:10:06,460 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:10:07,312 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 20 proven. 431 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2023-04-02 22:10:07,313 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [197470109] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:10:07,313 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [81205792] [2023-04-02 22:10:07,313 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:10:07,314 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:10:07,314 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:10:07,314 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:10:07,314 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:10:07,323 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:10:07,555 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:10:07,565 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:10:07,567 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:10:08,683 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14405#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:10:08,683 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:10:08,683 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:10:08,683 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 97 [2023-04-02 22:10:08,683 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859721860] [2023-04-02 22:10:08,683 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:10:08,684 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2023-04-02 22:10:08,684 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:10:08,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2023-04-02 22:10:08,685 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1980, Invalid=9792, Unknown=0, NotChecked=0, Total=11772 [2023-04-02 22:10:08,685 INFO L87 Difference]: Start difference. First operand 224 states and 279 transitions. Second operand has 97 states, 97 states have (on average 1.2989690721649485) internal successors, (126), 95 states have internal predecessors, (126), 23 states have call successors, (25), 3 states have call predecessors, (25), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2023-04-02 22:10:11,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:10:11,161 INFO L93 Difference]: Finished difference Result 565 states and 732 transitions. [2023-04-02 22:10:11,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2023-04-02 22:10:11,161 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.2989690721649485) internal successors, (126), 95 states have internal predecessors, (126), 23 states have call successors, (25), 3 states have call predecessors, (25), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) Word has length 105 [2023-04-02 22:10:11,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:10:11,164 INFO L225 Difference]: With dead ends: 565 [2023-04-02 22:10:11,164 INFO L226 Difference]: Without dead ends: 563 [2023-04-02 22:10:11,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 245 SyntacticMatches, 0 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9987 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=6252, Invalid=23850, Unknown=0, NotChecked=0, Total=30102 [2023-04-02 22:10:11,165 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 206 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 2500 mSolverCounterSat, 328 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 2828 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 328 IncrementalHoareTripleChecker+Valid, 2500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-04-02 22:10:11,166 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [206 Valid, 213 Invalid, 2828 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [328 Valid, 2500 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-04-02 22:10:11,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2023-04-02 22:10:11,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 531. [2023-04-02 22:10:11,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 531 states, 361 states have (on average 1.0387811634349031) internal successors, (375), 373 states have internal predecessors, (375), 157 states have call successors, (157), 13 states have call predecessors, (157), 12 states have return successors, (156), 144 states have call predecessors, (156), 156 states have call successors, (156) [2023-04-02 22:10:11,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 531 states to 531 states and 688 transitions. [2023-04-02 22:10:11,255 INFO L78 Accepts]: Start accepts. Automaton has 531 states and 688 transitions. Word has length 105 [2023-04-02 22:10:11,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:10:11,256 INFO L495 AbstractCegarLoop]: Abstraction has 531 states and 688 transitions. [2023-04-02 22:10:11,256 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.2989690721649485) internal successors, (126), 95 states have internal predecessors, (126), 23 states have call successors, (25), 3 states have call predecessors, (25), 1 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2023-04-02 22:10:11,256 INFO L276 IsEmpty]: Start isEmpty. Operand 531 states and 688 transitions. [2023-04-02 22:10:11,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-04-02 22:10:11,258 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:10:11,258 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:10:11,262 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2023-04-02 22:10:11,462 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:10:11,463 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:10:11,463 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:10:11,463 INFO L85 PathProgramCache]: Analyzing trace with hash 265552038, now seen corresponding path program 16 times [2023-04-02 22:10:11,463 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:10:11,463 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291379642] [2023-04-02 22:10:11,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:10:11,463 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:10:11,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:10:12,464 INFO L134 CoverageAnalysis]: Checked inductivity of 601 backedges. 200 proven. 137 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2023-04-02 22:10:12,464 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:10:12,464 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [291379642] [2023-04-02 22:10:12,464 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [291379642] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:10:12,464 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1029410173] [2023-04-02 22:10:12,464 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:10:12,464 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:10:12,464 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:10:12,465 INFO L229 MonitoredProcess]: Starting monitored process 20 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:10:12,468 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-04-02 22:10:12,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:10:12,518 INFO L262 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 60 conjunts are in the unsatisfiable core [2023-04-02 22:10:12,520 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:10:13,139 INFO L134 CoverageAnalysis]: Checked inductivity of 601 backedges. 24 proven. 313 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2023-04-02 22:10:13,139 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:10:14,620 INFO L134 CoverageAnalysis]: Checked inductivity of 601 backedges. 24 proven. 313 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2023-04-02 22:10:14,621 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1029410173] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:10:14,621 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [548507024] [2023-04-02 22:10:14,622 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:10:14,622 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:10:14,622 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:10:14,622 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:10:14,622 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:10:14,629 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:10:14,835 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:10:14,845 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:10:14,847 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:10:16,002 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17093#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:10:16,002 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:10:16,002 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:10:16,002 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 32, 32] total 77 [2023-04-02 22:10:16,002 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505432498] [2023-04-02 22:10:16,002 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:10:16,003 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2023-04-02 22:10:16,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:10:16,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2023-04-02 22:10:16,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=909, Invalid=6923, Unknown=0, NotChecked=0, Total=7832 [2023-04-02 22:10:16,004 INFO L87 Difference]: Start difference. First operand 531 states and 688 transitions. Second operand has 77 states, 76 states have (on average 1.5657894736842106) internal successors, (119), 75 states have internal predecessors, (119), 38 states have call successors, (40), 3 states have call predecessors, (40), 1 states have return successors, (37), 37 states have call predecessors, (37), 37 states have call successors, (37) [2023-04-02 22:10:19,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:10:19,335 INFO L93 Difference]: Finished difference Result 657 states and 830 transitions. [2023-04-02 22:10:19,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2023-04-02 22:10:19,337 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 76 states have (on average 1.5657894736842106) internal successors, (119), 75 states have internal predecessors, (119), 38 states have call successors, (40), 3 states have call predecessors, (40), 1 states have return successors, (37), 37 states have call predecessors, (37), 37 states have call successors, (37) Word has length 109 [2023-04-02 22:10:19,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:10:19,339 INFO L225 Difference]: With dead ends: 657 [2023-04-02 22:10:19,339 INFO L226 Difference]: Without dead ends: 577 [2023-04-02 22:10:19,341 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3967 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=1915, Invalid=12365, Unknown=0, NotChecked=0, Total=14280 [2023-04-02 22:10:19,341 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 174 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 2445 mSolverCounterSat, 242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 2687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 242 IncrementalHoareTripleChecker+Valid, 2445 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:10:19,341 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [175 Valid, 217 Invalid, 2687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [242 Valid, 2445 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-04-02 22:10:19,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2023-04-02 22:10:19,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 567. [2023-04-02 22:10:19,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 567 states, 386 states have (on average 1.038860103626943) internal successors, (401), 398 states have internal predecessors, (401), 167 states have call successors, (167), 14 states have call predecessors, (167), 13 states have return successors, (166), 154 states have call predecessors, (166), 166 states have call successors, (166) [2023-04-02 22:10:19,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 567 states to 567 states and 734 transitions. [2023-04-02 22:10:19,464 INFO L78 Accepts]: Start accepts. Automaton has 567 states and 734 transitions. Word has length 109 [2023-04-02 22:10:19,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:10:19,465 INFO L495 AbstractCegarLoop]: Abstraction has 567 states and 734 transitions. [2023-04-02 22:10:19,465 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 76 states have (on average 1.5657894736842106) internal successors, (119), 75 states have internal predecessors, (119), 38 states have call successors, (40), 3 states have call predecessors, (40), 1 states have return successors, (37), 37 states have call predecessors, (37), 37 states have call successors, (37) [2023-04-02 22:10:19,465 INFO L276 IsEmpty]: Start isEmpty. Operand 567 states and 734 transitions. [2023-04-02 22:10:19,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2023-04-02 22:10:19,467 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:10:19,467 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:10:19,479 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2023-04-02 22:10:19,672 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:10:19,672 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:10:19,672 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:10:19,672 INFO L85 PathProgramCache]: Analyzing trace with hash -1982068007, now seen corresponding path program 17 times [2023-04-02 22:10:19,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:10:19,673 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664282109] [2023-04-02 22:10:19,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:10:19,673 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:10:19,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:10:20,724 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 236 proven. 155 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2023-04-02 22:10:20,724 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:10:20,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664282109] [2023-04-02 22:10:20,724 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664282109] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:10:20,724 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50381367] [2023-04-02 22:10:20,724 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:10:20,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:10:20,725 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:10:20,725 INFO L229 MonitoredProcess]: Starting monitored process 21 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:10:20,726 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-04-02 22:10:20,786 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2023-04-02 22:10:20,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:10:20,787 INFO L262 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 70 conjunts are in the unsatisfiable core [2023-04-02 22:10:20,789 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:10:21,945 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 25 proven. 402 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2023-04-02 22:10:21,945 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:10:23,773 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 25 proven. 402 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2023-04-02 22:10:23,774 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [50381367] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:10:23,774 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1012193274] [2023-04-02 22:10:23,775 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:10:23,775 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:10:23,775 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:10:23,775 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:10:23,775 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:10:23,791 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:10:23,999 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:10:24,008 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:10:24,010 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:10:25,361 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19972#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:10:25,361 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:10:25,361 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:10:25,361 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 36, 36] total 97 [2023-04-02 22:10:25,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2082827363] [2023-04-02 22:10:25,362 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:10:25,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2023-04-02 22:10:25,362 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:10:25,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2023-04-02 22:10:25,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1281, Invalid=10491, Unknown=0, NotChecked=0, Total=11772 [2023-04-02 22:10:25,363 INFO L87 Difference]: Start difference. First operand 567 states and 734 transitions. Second operand has 97 states, 96 states have (on average 1.5) internal successors, (144), 95 states have internal predecessors, (144), 41 states have call successors, (43), 3 states have call predecessors, (43), 2 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2023-04-02 22:10:30,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:10:30,476 INFO L93 Difference]: Finished difference Result 687 states and 869 transitions. [2023-04-02 22:10:30,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2023-04-02 22:10:30,489 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 96 states have (on average 1.5) internal successors, (144), 95 states have internal predecessors, (144), 41 states have call successors, (43), 3 states have call predecessors, (43), 2 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) Word has length 117 [2023-04-02 22:10:30,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:10:30,491 INFO L225 Difference]: With dead ends: 687 [2023-04-02 22:10:30,491 INFO L226 Difference]: Without dead ends: 600 [2023-04-02 22:10:30,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 277 SyntacticMatches, 1 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7734 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=3039, Invalid=21453, Unknown=0, NotChecked=0, Total=24492 [2023-04-02 22:10:30,493 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 196 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 3438 mSolverCounterSat, 280 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 3718 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 280 IncrementalHoareTripleChecker+Valid, 3438 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-04-02 22:10:30,493 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [196 Valid, 236 Invalid, 3718 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [280 Valid, 3438 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-04-02 22:10:30,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 600 states. [2023-04-02 22:10:30,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 600 to 600. [2023-04-02 22:10:30,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 600 states, 409 states have (on average 1.039119804400978) internal successors, (425), 421 states have internal predecessors, (425), 176 states have call successors, (176), 15 states have call predecessors, (176), 14 states have return successors, (175), 163 states have call predecessors, (175), 175 states have call successors, (175) [2023-04-02 22:10:30,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 600 states to 600 states and 776 transitions. [2023-04-02 22:10:30,622 INFO L78 Accepts]: Start accepts. Automaton has 600 states and 776 transitions. Word has length 117 [2023-04-02 22:10:30,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:10:30,622 INFO L495 AbstractCegarLoop]: Abstraction has 600 states and 776 transitions. [2023-04-02 22:10:30,622 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 96 states have (on average 1.5) internal successors, (144), 95 states have internal predecessors, (144), 41 states have call successors, (43), 3 states have call predecessors, (43), 2 states have return successors, (40), 40 states have call predecessors, (40), 40 states have call successors, (40) [2023-04-02 22:10:30,623 INFO L276 IsEmpty]: Start isEmpty. Operand 600 states and 776 transitions. [2023-04-02 22:10:30,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-04-02 22:10:30,625 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:10:30,625 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:10:30,629 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2023-04-02 22:10:30,829 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-04-02 22:10:30,829 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:10:30,829 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:10:30,829 INFO L85 PathProgramCache]: Analyzing trace with hash -1667471034, now seen corresponding path program 18 times [2023-04-02 22:10:30,829 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:10:30,829 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790561581] [2023-04-02 22:10:30,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:10:30,830 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:10:30,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:10:31,975 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 275 proven. 174 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-04-02 22:10:31,975 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:10:31,975 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790561581] [2023-04-02 22:10:31,975 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790561581] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:10:31,975 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [496155272] [2023-04-02 22:10:31,975 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:10:31,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:10:31,976 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:10:31,976 INFO L229 MonitoredProcess]: Starting monitored process 22 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:10:31,977 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-04-02 22:10:32,043 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:10:32,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:10:32,044 INFO L262 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 68 conjunts are in the unsatisfiable core [2023-04-02 22:10:32,046 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:10:32,790 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 28 proven. 421 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-04-02 22:10:32,790 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:10:34,567 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 28 proven. 421 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2023-04-02 22:10:34,567 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [496155272] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:10:34,567 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [692659569] [2023-04-02 22:10:34,568 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:10:34,568 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:10:34,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:10:34,568 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:10:34,568 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:10:34,575 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:10:34,781 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:10:34,790 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:10:34,792 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:10:36,048 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23030#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:10:36,049 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:10:36,049 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:10:36,049 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 36, 36] total 86 [2023-04-02 22:10:36,049 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288089106] [2023-04-02 22:10:36,049 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:10:36,049 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2023-04-02 22:10:36,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:10:36,050 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2023-04-02 22:10:36,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1121, Invalid=8385, Unknown=0, NotChecked=0, Total=9506 [2023-04-02 22:10:36,051 INFO L87 Difference]: Start difference. First operand 600 states and 776 transitions. Second operand has 86 states, 85 states have (on average 1.576470588235294) internal successors, (134), 84 states have internal predecessors, (134), 44 states have call successors, (46), 3 states have call predecessors, (46), 1 states have return successors, (43), 43 states have call predecessors, (43), 43 states have call successors, (43) [2023-04-02 22:10:40,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:10:40,583 INFO L93 Difference]: Finished difference Result 732 states and 922 transitions. [2023-04-02 22:10:40,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2023-04-02 22:10:40,585 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 85 states have (on average 1.576470588235294) internal successors, (134), 84 states have internal predecessors, (134), 44 states have call successors, (46), 3 states have call predecessors, (46), 1 states have return successors, (43), 43 states have call predecessors, (43), 43 states have call successors, (43) Word has length 125 [2023-04-02 22:10:40,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:10:40,587 INFO L225 Difference]: With dead ends: 732 [2023-04-02 22:10:40,587 INFO L226 Difference]: Without dead ends: 638 [2023-04-02 22:10:40,588 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 446 GetRequests, 314 SyntacticMatches, 1 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4896 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=2398, Invalid=15158, Unknown=0, NotChecked=0, Total=17556 [2023-04-02 22:10:40,589 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 208 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 3564 mSolverCounterSat, 308 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 3872 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 308 IncrementalHoareTripleChecker+Valid, 3564 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2023-04-02 22:10:40,589 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [209 Valid, 270 Invalid, 3872 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [308 Valid, 3564 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2023-04-02 22:10:40,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 638 states. [2023-04-02 22:10:40,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 638 to 630. [2023-04-02 22:10:40,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 630 states, 430 states have (on average 1.0395348837209302) internal successors, (447), 442 states have internal predecessors, (447), 184 states have call successors, (184), 16 states have call predecessors, (184), 15 states have return successors, (183), 171 states have call predecessors, (183), 183 states have call successors, (183) [2023-04-02 22:10:40,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 630 states to 630 states and 814 transitions. [2023-04-02 22:10:40,730 INFO L78 Accepts]: Start accepts. Automaton has 630 states and 814 transitions. Word has length 125 [2023-04-02 22:10:40,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:10:40,730 INFO L495 AbstractCegarLoop]: Abstraction has 630 states and 814 transitions. [2023-04-02 22:10:40,730 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 85 states have (on average 1.576470588235294) internal successors, (134), 84 states have internal predecessors, (134), 44 states have call successors, (46), 3 states have call predecessors, (46), 1 states have return successors, (43), 43 states have call predecessors, (43), 43 states have call successors, (43) [2023-04-02 22:10:40,730 INFO L276 IsEmpty]: Start isEmpty. Operand 630 states and 814 transitions. [2023-04-02 22:10:40,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2023-04-02 22:10:40,732 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:10:40,732 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:10:40,737 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2023-04-02 22:10:40,937 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-04-02 22:10:40,938 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:10:40,938 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:10:40,938 INFO L85 PathProgramCache]: Analyzing trace with hash -1742070215, now seen corresponding path program 19 times [2023-04-02 22:10:40,938 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:10:40,938 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790140947] [2023-04-02 22:10:40,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:10:40,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:10:40,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:10:42,195 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 317 proven. 194 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2023-04-02 22:10:42,196 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:10:42,196 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790140947] [2023-04-02 22:10:42,196 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790140947] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:10:42,196 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974637702] [2023-04-02 22:10:42,196 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:10:42,196 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:10:42,196 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:10:42,197 INFO L229 MonitoredProcess]: Starting monitored process 23 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:10:42,203 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2023-04-02 22:10:42,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:10:42,260 INFO L262 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 72 conjunts are in the unsatisfiable core [2023-04-02 22:10:42,263 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:10:43,111 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 30 proven. 481 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2023-04-02 22:10:43,111 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:10:45,089 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 30 proven. 481 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2023-04-02 22:10:45,089 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974637702] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:10:45,090 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2018910845] [2023-04-02 22:10:45,090 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:10:45,090 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:10:45,091 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:10:45,091 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:10:45,091 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:10:45,099 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:10:45,311 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:10:45,320 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:10:45,322 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:10:46,653 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26232#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:10:46,653 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:10:46,653 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:10:46,653 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 92 [2023-04-02 22:10:46,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097113554] [2023-04-02 22:10:46,654 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:10:46,654 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2023-04-02 22:10:46,654 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:10:46,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2023-04-02 22:10:46,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1266, Invalid=9446, Unknown=0, NotChecked=0, Total=10712 [2023-04-02 22:10:46,655 INFO L87 Difference]: Start difference. First operand 630 states and 814 transitions. Second operand has 92 states, 91 states have (on average 1.5714285714285714) internal successors, (143), 90 states have internal predecessors, (143), 47 states have call successors, (49), 3 states have call predecessors, (49), 1 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2023-04-02 22:10:51,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:10:51,650 INFO L93 Difference]: Finished difference Result 761 states and 959 transitions. [2023-04-02 22:10:51,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2023-04-02 22:10:51,651 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 91 states have (on average 1.5714285714285714) internal successors, (143), 90 states have internal predecessors, (143), 47 states have call successors, (49), 3 states have call predecessors, (49), 1 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) Word has length 133 [2023-04-02 22:10:51,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:10:51,653 INFO L225 Difference]: With dead ends: 761 [2023-04-02 22:10:51,653 INFO L226 Difference]: Without dead ends: 660 [2023-04-02 22:10:51,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 474 GetRequests, 334 SyntacticMatches, 1 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5494 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=2713, Invalid=17027, Unknown=0, NotChecked=0, Total=19740 [2023-04-02 22:10:51,654 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 231 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 3888 mSolverCounterSat, 346 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 232 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 4234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 346 IncrementalHoareTripleChecker+Valid, 3888 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2023-04-02 22:10:51,655 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [232 Valid, 283 Invalid, 4234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [346 Valid, 3888 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2023-04-02 22:10:51,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 660 states. [2023-04-02 22:10:51,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 660 to 653. [2023-04-02 22:10:51,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 653 states, 446 states have (on average 1.0403587443946187) internal successors, (464), 458 states have internal predecessors, (464), 191 states have call successors, (191), 16 states have call predecessors, (191), 15 states have return successors, (190), 178 states have call predecessors, (190), 190 states have call successors, (190) [2023-04-02 22:10:51,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 653 states to 653 states and 845 transitions. [2023-04-02 22:10:51,801 INFO L78 Accepts]: Start accepts. Automaton has 653 states and 845 transitions. Word has length 133 [2023-04-02 22:10:51,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:10:51,802 INFO L495 AbstractCegarLoop]: Abstraction has 653 states and 845 transitions. [2023-04-02 22:10:51,802 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 91 states have (on average 1.5714285714285714) internal successors, (143), 90 states have internal predecessors, (143), 47 states have call successors, (49), 3 states have call predecessors, (49), 1 states have return successors, (46), 46 states have call predecessors, (46), 46 states have call successors, (46) [2023-04-02 22:10:51,802 INFO L276 IsEmpty]: Start isEmpty. Operand 653 states and 845 transitions. [2023-04-02 22:10:51,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2023-04-02 22:10:51,804 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:10:51,804 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:10:51,809 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2023-04-02 22:10:52,009 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:10:52,009 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:10:52,009 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:10:52,009 INFO L85 PathProgramCache]: Analyzing trace with hash 738408934, now seen corresponding path program 20 times [2023-04-02 22:10:52,009 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:10:52,009 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1557546715] [2023-04-02 22:10:52,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:10:52,010 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:10:52,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:10:53,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1057 backedges. 362 proven. 215 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2023-04-02 22:10:53,390 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:10:53,390 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1557546715] [2023-04-02 22:10:53,390 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1557546715] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:10:53,390 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1906275385] [2023-04-02 22:10:53,390 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:10:53,390 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:10:53,390 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:10:53,393 INFO L229 MonitoredProcess]: Starting monitored process 24 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:10:53,395 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2023-04-02 22:10:53,474 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2023-04-02 22:10:53,474 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:10:53,476 INFO L262 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 82 conjunts are in the unsatisfiable core [2023-04-02 22:10:53,478 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:10:54,983 INFO L134 CoverageAnalysis]: Checked inductivity of 1057 backedges. 34 proven. 588 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2023-04-02 22:10:54,984 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:10:57,419 INFO L134 CoverageAnalysis]: Checked inductivity of 1057 backedges. 34 proven. 588 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2023-04-02 22:10:57,419 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1906275385] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:10:57,419 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1683153994] [2023-04-02 22:10:57,420 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:10:57,420 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:10:57,420 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:10:57,420 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:10:57,420 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:10:57,428 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:10:57,663 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:10:57,672 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:10:57,674 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:10:59,174 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29596#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:10:59,174 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:10:59,174 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:10:59,174 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 42, 42] total 115 [2023-04-02 22:10:59,174 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778887030] [2023-04-02 22:10:59,175 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:10:59,175 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2023-04-02 22:10:59,175 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:10:59,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2023-04-02 22:10:59,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1765, Invalid=14237, Unknown=0, NotChecked=0, Total=16002 [2023-04-02 22:10:59,177 INFO L87 Difference]: Start difference. First operand 653 states and 845 transitions. Second operand has 115 states, 114 states have (on average 1.5) internal successors, (171), 113 states have internal predecessors, (171), 50 states have call successors, (52), 3 states have call predecessors, (52), 2 states have return successors, (49), 49 states have call predecessors, (49), 49 states have call successors, (49) [2023-04-02 22:11:05,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:11:05,963 INFO L93 Difference]: Finished difference Result 781 states and 986 transitions. [2023-04-02 22:11:05,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2023-04-02 22:11:05,963 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 114 states have (on average 1.5) internal successors, (171), 113 states have internal predecessors, (171), 50 states have call successors, (52), 3 states have call predecessors, (52), 2 states have return successors, (49), 49 states have call predecessors, (49), 49 states have call successors, (49) Word has length 141 [2023-04-02 22:11:05,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:11:05,966 INFO L225 Difference]: With dead ends: 781 [2023-04-02 22:11:05,966 INFO L226 Difference]: Without dead ends: 677 [2023-04-02 22:11:05,967 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 519 GetRequests, 337 SyntacticMatches, 1 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10807 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=4212, Invalid=29094, Unknown=0, NotChecked=0, Total=33306 [2023-04-02 22:11:05,967 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 262 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 4293 mSolverCounterSat, 389 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 229 SdHoareTripleChecker+Invalid, 4682 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 389 IncrementalHoareTripleChecker+Valid, 4293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2023-04-02 22:11:05,968 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [262 Valid, 229 Invalid, 4682 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [389 Valid, 4293 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2023-04-02 22:11:05,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 677 states. [2023-04-02 22:11:06,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 677 to 677. [2023-04-02 22:11:06,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 677 states, 463 states have (on average 1.041036717062635) internal successors, (482), 475 states have internal predecessors, (482), 197 states have call successors, (197), 17 states have call predecessors, (197), 16 states have return successors, (196), 184 states have call predecessors, (196), 196 states have call successors, (196) [2023-04-02 22:11:06,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 677 states to 677 states and 875 transitions. [2023-04-02 22:11:06,111 INFO L78 Accepts]: Start accepts. Automaton has 677 states and 875 transitions. Word has length 141 [2023-04-02 22:11:06,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:11:06,111 INFO L495 AbstractCegarLoop]: Abstraction has 677 states and 875 transitions. [2023-04-02 22:11:06,111 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 114 states have (on average 1.5) internal successors, (171), 113 states have internal predecessors, (171), 50 states have call successors, (52), 3 states have call predecessors, (52), 2 states have return successors, (49), 49 states have call predecessors, (49), 49 states have call successors, (49) [2023-04-02 22:11:06,111 INFO L276 IsEmpty]: Start isEmpty. Operand 677 states and 875 transitions. [2023-04-02 22:11:06,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-04-02 22:11:06,113 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:11:06,113 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:11:06,120 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2023-04-02 22:11:06,318 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,24 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:11:06,319 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:11:06,319 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:11:06,319 INFO L85 PathProgramCache]: Analyzing trace with hash -1015756391, now seen corresponding path program 21 times [2023-04-02 22:11:06,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:11:06,319 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252169227] [2023-04-02 22:11:06,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:11:06,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:11:06,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:11:07,793 INFO L134 CoverageAnalysis]: Checked inductivity of 1191 backedges. 410 proven. 237 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2023-04-02 22:11:07,793 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:11:07,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252169227] [2023-04-02 22:11:07,794 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1252169227] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:11:07,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1669953539] [2023-04-02 22:11:07,794 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:11:07,794 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:11:07,794 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:11:07,795 INFO L229 MonitoredProcess]: Starting monitored process 25 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:11:07,807 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2023-04-02 22:11:07,866 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:11:07,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:11:07,869 INFO L262 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 80 conjunts are in the unsatisfiable core [2023-04-02 22:11:07,871 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:11:08,875 INFO L134 CoverageAnalysis]: Checked inductivity of 1191 backedges. 34 proven. 613 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2023-04-02 22:11:08,876 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:11:11,274 INFO L134 CoverageAnalysis]: Checked inductivity of 1191 backedges. 34 proven. 613 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2023-04-02 22:11:11,274 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1669953539] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:11:11,275 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [386400391] [2023-04-02 22:11:11,275 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:11:11,275 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:11:11,276 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:11:11,276 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:11:11,276 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:11:11,283 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:11:11,501 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:11:11,511 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:11:11,512 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:11:12,923 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33109#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:11:12,923 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:11:12,923 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:11:12,923 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 102 [2023-04-02 22:11:12,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953071484] [2023-04-02 22:11:12,923 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:11:12,924 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 102 states [2023-04-02 22:11:12,924 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:11:12,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2023-04-02 22:11:12,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1539, Invalid=11343, Unknown=0, NotChecked=0, Total=12882 [2023-04-02 22:11:12,925 INFO L87 Difference]: Start difference. First operand 677 states and 875 transitions. Second operand has 102 states, 101 states have (on average 1.5742574257425743) internal successors, (159), 100 states have internal predecessors, (159), 53 states have call successors, (55), 3 states have call predecessors, (55), 1 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2023-04-02 22:11:19,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:11:19,228 INFO L93 Difference]: Finished difference Result 810 states and 1021 transitions. [2023-04-02 22:11:19,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2023-04-02 22:11:19,236 INFO L78 Accepts]: Start accepts. Automaton has has 102 states, 101 states have (on average 1.5742574257425743) internal successors, (159), 100 states have internal predecessors, (159), 53 states have call successors, (55), 3 states have call predecessors, (55), 1 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) Word has length 149 [2023-04-02 22:11:19,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:11:19,239 INFO L225 Difference]: With dead ends: 810 [2023-04-02 22:11:19,239 INFO L226 Difference]: Without dead ends: 699 [2023-04-02 22:11:19,240 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 376 SyntacticMatches, 1 SemanticMatches, 153 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6647 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=3325, Invalid=20545, Unknown=0, NotChecked=0, Total=23870 [2023-04-02 22:11:19,241 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 276 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 4792 mSolverCounterSat, 443 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 315 SdHoareTripleChecker+Invalid, 5235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 443 IncrementalHoareTripleChecker+Valid, 4792 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-04-02 22:11:19,244 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [277 Valid, 315 Invalid, 5235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [443 Valid, 4792 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-04-02 22:11:19,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 699 states. [2023-04-02 22:11:19,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 699 to 694. [2023-04-02 22:11:19,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 694 states, 475 states have (on average 1.0421052631578946) internal successors, (495), 487 states have internal predecessors, (495), 202 states have call successors, (202), 17 states have call predecessors, (202), 16 states have return successors, (201), 189 states have call predecessors, (201), 201 states have call successors, (201) [2023-04-02 22:11:19,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 694 states to 694 states and 898 transitions. [2023-04-02 22:11:19,405 INFO L78 Accepts]: Start accepts. Automaton has 694 states and 898 transitions. Word has length 149 [2023-04-02 22:11:19,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:11:19,405 INFO L495 AbstractCegarLoop]: Abstraction has 694 states and 898 transitions. [2023-04-02 22:11:19,405 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 102 states, 101 states have (on average 1.5742574257425743) internal successors, (159), 100 states have internal predecessors, (159), 53 states have call successors, (55), 3 states have call predecessors, (55), 1 states have return successors, (52), 52 states have call predecessors, (52), 52 states have call successors, (52) [2023-04-02 22:11:19,406 INFO L276 IsEmpty]: Start isEmpty. Operand 694 states and 898 transitions. [2023-04-02 22:11:19,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2023-04-02 22:11:19,408 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:11:19,408 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:11:19,412 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2023-04-02 22:11:19,612 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2023-04-02 22:11:19,613 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:11:19,613 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:11:19,613 INFO L85 PathProgramCache]: Analyzing trace with hash 280130182, now seen corresponding path program 22 times [2023-04-02 22:11:19,613 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:11:19,613 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442764687] [2023-04-02 22:11:19,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:11:19,613 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:11:19,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:11:21,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1333 backedges. 461 proven. 260 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-04-02 22:11:21,218 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:11:21,219 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442764687] [2023-04-02 22:11:21,219 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [442764687] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:11:21,219 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250668235] [2023-04-02 22:11:21,219 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:11:21,219 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:11:21,219 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:11:21,220 INFO L229 MonitoredProcess]: Starting monitored process 26 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:11:21,223 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2023-04-02 22:11:21,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:11:21,287 INFO L262 TraceCheckSpWp]: Trace formula consists of 403 conjuncts, 84 conjunts are in the unsatisfiable core [2023-04-02 22:11:21,290 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:11:22,384 INFO L134 CoverageAnalysis]: Checked inductivity of 1333 backedges. 36 proven. 685 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-04-02 22:11:22,384 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:11:25,004 INFO L134 CoverageAnalysis]: Checked inductivity of 1333 backedges. 36 proven. 685 refuted. 0 times theorem prover too weak. 612 trivial. 0 not checked. [2023-04-02 22:11:25,004 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [250668235] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:11:25,004 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [452552754] [2023-04-02 22:11:25,005 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:11:25,005 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:11:25,005 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:11:25,005 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:11:25,005 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:11:25,030 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:11:25,218 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:11:25,239 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:11:25,241 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:11:26,752 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36718#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:11:26,753 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:11:26,753 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:11:26,753 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 44, 44] total 107 [2023-04-02 22:11:26,753 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891782777] [2023-04-02 22:11:26,753 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:11:26,753 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2023-04-02 22:11:26,753 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:11:26,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2023-04-02 22:11:26,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1686, Invalid=12356, Unknown=0, NotChecked=0, Total=14042 [2023-04-02 22:11:26,755 INFO L87 Difference]: Start difference. First operand 694 states and 898 transitions. Second operand has 107 states, 106 states have (on average 1.5754716981132075) internal successors, (167), 105 states have internal predecessors, (167), 56 states have call successors, (58), 3 states have call predecessors, (58), 1 states have return successors, (55), 55 states have call predecessors, (55), 55 states have call successors, (55) [2023-04-02 22:11:33,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:11:33,816 INFO L93 Difference]: Finished difference Result 830 states and 1046 transitions. [2023-04-02 22:11:33,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2023-04-02 22:11:33,817 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 106 states have (on average 1.5754716981132075) internal successors, (167), 105 states have internal predecessors, (167), 56 states have call successors, (58), 3 states have call predecessors, (58), 1 states have return successors, (55), 55 states have call predecessors, (55), 55 states have call successors, (55) Word has length 157 [2023-04-02 22:11:33,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:11:33,819 INFO L225 Difference]: With dead ends: 830 [2023-04-02 22:11:33,820 INFO L226 Difference]: Without dead ends: 716 [2023-04-02 22:11:33,821 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 397 SyntacticMatches, 1 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7264 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=3655, Invalid=22427, Unknown=0, NotChecked=0, Total=26082 [2023-04-02 22:11:33,821 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 301 mSDsluCounter, 292 mSDsCounter, 0 mSdLazyCounter, 5182 mSolverCounterSat, 464 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 302 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 5646 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 464 IncrementalHoareTripleChecker+Valid, 5182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:11:33,821 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [302 Valid, 319 Invalid, 5646 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [464 Valid, 5182 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2023-04-02 22:11:33,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 716 states. [2023-04-02 22:11:33,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 716 to 712. [2023-04-02 22:11:33,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 712 states, 488 states have (on average 1.0430327868852458) internal successors, (509), 500 states have internal predecessors, (509), 206 states have call successors, (206), 18 states have call predecessors, (206), 17 states have return successors, (205), 193 states have call predecessors, (205), 205 states have call successors, (205) [2023-04-02 22:11:33,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 712 states to 712 states and 920 transitions. [2023-04-02 22:11:33,992 INFO L78 Accepts]: Start accepts. Automaton has 712 states and 920 transitions. Word has length 157 [2023-04-02 22:11:33,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:11:33,992 INFO L495 AbstractCegarLoop]: Abstraction has 712 states and 920 transitions. [2023-04-02 22:11:33,992 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 106 states have (on average 1.5754716981132075) internal successors, (167), 105 states have internal predecessors, (167), 56 states have call successors, (58), 3 states have call predecessors, (58), 1 states have return successors, (55), 55 states have call predecessors, (55), 55 states have call successors, (55) [2023-04-02 22:11:33,992 INFO L276 IsEmpty]: Start isEmpty. Operand 712 states and 920 transitions. [2023-04-02 22:11:33,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2023-04-02 22:11:33,994 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:11:33,995 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:11:34,013 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2023-04-02 22:11:34,216 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2023-04-02 22:11:34,216 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:11:34,216 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:11:34,216 INFO L85 PathProgramCache]: Analyzing trace with hash 97651961, now seen corresponding path program 23 times [2023-04-02 22:11:34,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:11:34,216 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670207674] [2023-04-02 22:11:34,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:11:34,216 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:11:34,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:11:35,980 INFO L134 CoverageAnalysis]: Checked inductivity of 1483 backedges. 515 proven. 284 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2023-04-02 22:11:35,981 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:11:35,981 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670207674] [2023-04-02 22:11:35,981 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [670207674] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:11:35,981 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [558010799] [2023-04-02 22:11:35,981 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:11:35,981 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:11:35,981 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:11:35,982 INFO L229 MonitoredProcess]: Starting monitored process 27 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:11:35,982 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2023-04-02 22:11:36,073 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 20 check-sat command(s) [2023-04-02 22:11:36,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:11:36,076 INFO L262 TraceCheckSpWp]: Trace formula consists of 422 conjuncts, 94 conjunts are in the unsatisfiable core [2023-04-02 22:11:36,079 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:11:38,099 INFO L134 CoverageAnalysis]: Checked inductivity of 1483 backedges. 37 proven. 816 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2023-04-02 22:11:38,099 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:11:41,306 INFO L134 CoverageAnalysis]: Checked inductivity of 1483 backedges. 37 proven. 816 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2023-04-02 22:11:41,306 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [558010799] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:11:41,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1896833785] [2023-04-02 22:11:41,307 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:11:41,307 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:11:41,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:11:41,308 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:11:41,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:11:41,315 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:11:41,519 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:11:41,528 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:11:41,530 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:11:43,201 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40467#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:11:43,201 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:11:43,201 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:11:43,201 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 48, 48] total 133 [2023-04-02 22:11:43,201 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763452430] [2023-04-02 22:11:43,201 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:11:43,202 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2023-04-02 22:11:43,202 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:11:43,203 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2023-04-02 22:11:43,203 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2329, Invalid=18551, Unknown=0, NotChecked=0, Total=20880 [2023-04-02 22:11:43,204 INFO L87 Difference]: Start difference. First operand 712 states and 920 transitions. Second operand has 133 states, 132 states have (on average 1.5) internal successors, (198), 131 states have internal predecessors, (198), 59 states have call successors, (61), 3 states have call predecessors, (61), 2 states have return successors, (58), 58 states have call predecessors, (58), 58 states have call successors, (58) [2023-04-02 22:11:53,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:11:53,060 INFO L93 Difference]: Finished difference Result 848 states and 1067 transitions. [2023-04-02 22:11:53,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2023-04-02 22:11:53,061 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 132 states have (on average 1.5) internal successors, (198), 131 states have internal predecessors, (198), 59 states have call successors, (61), 3 states have call predecessors, (61), 2 states have return successors, (58), 58 states have call predecessors, (58), 58 states have call successors, (58) Word has length 165 [2023-04-02 22:11:53,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:11:53,063 INFO L225 Difference]: With dead ends: 848 [2023-04-02 22:11:53,063 INFO L226 Difference]: Without dead ends: 727 [2023-04-02 22:11:53,065 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 397 SyntacticMatches, 1 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14333 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=5621, Invalid=38269, Unknown=0, NotChecked=0, Total=43890 [2023-04-02 22:11:53,065 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 329 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 6176 mSolverCounterSat, 514 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 329 SdHoareTripleChecker+Valid, 283 SdHoareTripleChecker+Invalid, 6690 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 514 IncrementalHoareTripleChecker+Valid, 6176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2023-04-02 22:11:53,065 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [329 Valid, 283 Invalid, 6690 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [514 Valid, 6176 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2023-04-02 22:11:53,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 727 states. [2023-04-02 22:11:53,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 727 to 727. [2023-04-02 22:11:53,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 727 states, 499 states have (on average 1.0440881763527055) internal successors, (521), 511 states have internal predecessors, (521), 209 states have call successors, (209), 19 states have call predecessors, (209), 18 states have return successors, (208), 196 states have call predecessors, (208), 208 states have call successors, (208) [2023-04-02 22:11:53,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 727 states to 727 states and 938 transitions. [2023-04-02 22:11:53,248 INFO L78 Accepts]: Start accepts. Automaton has 727 states and 938 transitions. Word has length 165 [2023-04-02 22:11:53,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:11:53,248 INFO L495 AbstractCegarLoop]: Abstraction has 727 states and 938 transitions. [2023-04-02 22:11:53,248 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 132 states have (on average 1.5) internal successors, (198), 131 states have internal predecessors, (198), 59 states have call successors, (61), 3 states have call predecessors, (61), 2 states have return successors, (58), 58 states have call predecessors, (58), 58 states have call successors, (58) [2023-04-02 22:11:53,248 INFO L276 IsEmpty]: Start isEmpty. Operand 727 states and 938 transitions. [2023-04-02 22:11:53,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2023-04-02 22:11:53,251 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:11:53,251 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:11:53,257 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2023-04-02 22:11:53,456 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2023-04-02 22:11:53,457 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:11:53,457 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:11:53,457 INFO L85 PathProgramCache]: Analyzing trace with hash -1412164826, now seen corresponding path program 24 times [2023-04-02 22:11:53,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:11:53,457 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1967364208] [2023-04-02 22:11:53,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:11:53,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:11:53,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:11:55,462 INFO L134 CoverageAnalysis]: Checked inductivity of 1641 backedges. 572 proven. 309 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-04-02 22:11:55,463 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:11:55,463 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1967364208] [2023-04-02 22:11:55,463 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1967364208] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:11:55,463 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [295923431] [2023-04-02 22:11:55,463 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:11:55,463 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:11:55,463 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:11:55,464 INFO L229 MonitoredProcess]: Starting monitored process 28 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:11:55,464 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2023-04-02 22:11:55,538 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:11:55,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:11:55,541 INFO L262 TraceCheckSpWp]: Trace formula consists of 441 conjuncts, 92 conjunts are in the unsatisfiable core [2023-04-02 22:11:55,544 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:11:56,800 INFO L134 CoverageAnalysis]: Checked inductivity of 1641 backedges. 40 proven. 841 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-04-02 22:11:56,800 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:11:59,857 INFO L134 CoverageAnalysis]: Checked inductivity of 1641 backedges. 40 proven. 841 refuted. 0 times theorem prover too weak. 760 trivial. 0 not checked. [2023-04-02 22:11:59,858 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [295923431] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:11:59,858 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1670428355] [2023-04-02 22:11:59,858 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:11:59,858 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:11:59,859 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:11:59,859 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:11:59,859 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:11:59,866 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:12:00,071 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:12:00,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:12:00,083 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:12:01,657 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44345#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:12:01,657 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:12:01,657 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:12:01,657 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 48, 48] total 116 [2023-04-02 22:12:01,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056323506] [2023-04-02 22:12:01,657 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:12:01,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2023-04-02 22:12:01,658 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:12:01,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2023-04-02 22:12:01,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1976, Invalid=14280, Unknown=0, NotChecked=0, Total=16256 [2023-04-02 22:12:01,659 INFO L87 Difference]: Start difference. First operand 727 states and 938 transitions. Second operand has 116 states, 115 states have (on average 1.5826086956521739) internal successors, (182), 114 states have internal predecessors, (182), 62 states have call successors, (64), 3 states have call predecessors, (64), 1 states have return successors, (61), 61 states have call predecessors, (61), 61 states have call successors, (61) [2023-04-02 22:12:10,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:12:10,121 INFO L93 Difference]: Finished difference Result 869 states and 1090 transitions. [2023-04-02 22:12:10,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2023-04-02 22:12:10,122 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 115 states have (on average 1.5826086956521739) internal successors, (182), 114 states have internal predecessors, (182), 62 states have call successors, (64), 3 states have call predecessors, (64), 1 states have return successors, (61), 61 states have call predecessors, (61), 61 states have call successors, (61) Word has length 173 [2023-04-02 22:12:10,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:12:10,124 INFO L225 Difference]: With dead ends: 869 [2023-04-02 22:12:10,124 INFO L226 Difference]: Without dead ends: 741 [2023-04-02 22:12:10,126 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 440 SyntacticMatches, 1 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8499 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=4318, Invalid=26132, Unknown=0, NotChecked=0, Total=30450 [2023-04-02 22:12:10,126 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 352 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 5948 mSolverCounterSat, 577 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 353 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 6525 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 577 IncrementalHoareTripleChecker+Valid, 5948 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2023-04-02 22:12:10,126 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [353 Valid, 309 Invalid, 6525 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [577 Valid, 5948 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2023-04-02 22:12:10,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 741 states. [2023-04-02 22:12:10,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 741 to 739. [2023-04-02 22:12:10,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 739 states, 508 states have (on average 1.045275590551181) internal successors, (531), 520 states have internal predecessors, (531), 211 states have call successors, (211), 20 states have call predecessors, (211), 19 states have return successors, (210), 198 states have call predecessors, (210), 210 states have call successors, (210) [2023-04-02 22:12:10,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 739 states to 739 states and 952 transitions. [2023-04-02 22:12:10,318 INFO L78 Accepts]: Start accepts. Automaton has 739 states and 952 transitions. Word has length 173 [2023-04-02 22:12:10,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:12:10,318 INFO L495 AbstractCegarLoop]: Abstraction has 739 states and 952 transitions. [2023-04-02 22:12:10,318 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 115 states have (on average 1.5826086956521739) internal successors, (182), 114 states have internal predecessors, (182), 62 states have call successors, (64), 3 states have call predecessors, (64), 1 states have return successors, (61), 61 states have call predecessors, (61), 61 states have call successors, (61) [2023-04-02 22:12:10,318 INFO L276 IsEmpty]: Start isEmpty. Operand 739 states and 952 transitions. [2023-04-02 22:12:10,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2023-04-02 22:12:10,320 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:12:10,321 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:12:10,341 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2023-04-02 22:12:10,526 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2023-04-02 22:12:10,526 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:12:10,526 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:12:10,527 INFO L85 PathProgramCache]: Analyzing trace with hash -86513575, now seen corresponding path program 25 times [2023-04-02 22:12:10,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:12:10,527 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30138607] [2023-04-02 22:12:10,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:12:10,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:12:10,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:12:12,590 INFO L134 CoverageAnalysis]: Checked inductivity of 1807 backedges. 632 proven. 335 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2023-04-02 22:12:12,590 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:12:12,590 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30138607] [2023-04-02 22:12:12,590 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30138607] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:12:12,590 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1798970227] [2023-04-02 22:12:12,590 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:12:12,590 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:12:12,590 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:12:12,591 INFO L229 MonitoredProcess]: Starting monitored process 29 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:12:12,592 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2023-04-02 22:12:12,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:12:12,670 INFO L262 TraceCheckSpWp]: Trace formula consists of 460 conjuncts, 96 conjunts are in the unsatisfiable core [2023-04-02 22:12:12,673 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:12:14,096 INFO L134 CoverageAnalysis]: Checked inductivity of 1807 backedges. 42 proven. 925 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2023-04-02 22:12:14,096 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:12:17,414 INFO L134 CoverageAnalysis]: Checked inductivity of 1807 backedges. 42 proven. 925 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2023-04-02 22:12:17,414 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1798970227] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:12:17,414 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [63073131] [2023-04-02 22:12:17,415 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:12:17,415 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:12:17,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:12:17,415 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:12:17,416 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:12:17,425 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:12:17,626 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:12:17,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:12:17,645 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:12:19,246 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48291#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:12:19,246 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:12:19,247 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:12:19,247 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 122 [2023-04-02 22:12:19,247 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313723356] [2023-04-02 22:12:19,247 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:12:19,247 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 122 states [2023-04-02 22:12:19,247 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:12:19,248 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2023-04-02 22:12:19,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2169, Invalid=15653, Unknown=0, NotChecked=0, Total=17822 [2023-04-02 22:12:19,249 INFO L87 Difference]: Start difference. First operand 739 states and 952 transitions. Second operand has 122 states, 121 states have (on average 1.578512396694215) internal successors, (191), 120 states have internal predecessors, (191), 65 states have call successors, (67), 3 states have call predecessors, (67), 1 states have return successors, (64), 64 states have call predecessors, (64), 64 states have call successors, (64) [2023-04-02 22:12:28,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:12:28,791 INFO L93 Difference]: Finished difference Result 883 states and 1107 transitions. [2023-04-02 22:12:28,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2023-04-02 22:12:28,791 INFO L78 Accepts]: Start accepts. Automaton has has 122 states, 121 states have (on average 1.578512396694215) internal successors, (191), 120 states have internal predecessors, (191), 65 states have call successors, (67), 3 states have call predecessors, (67), 1 states have return successors, (64), 64 states have call predecessors, (64), 64 states have call successors, (64) Word has length 181 [2023-04-02 22:12:28,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:12:28,794 INFO L225 Difference]: With dead ends: 883 [2023-04-02 22:12:28,794 INFO L226 Difference]: Without dead ends: 748 [2023-04-02 22:12:28,795 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 642 GetRequests, 460 SyntacticMatches, 1 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9277 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=4741, Invalid=28565, Unknown=0, NotChecked=0, Total=33306 [2023-04-02 22:12:28,795 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 380 mSDsluCounter, 334 mSDsCounter, 0 mSdLazyCounter, 7351 mSolverCounterSat, 601 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 381 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 7952 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 601 IncrementalHoareTripleChecker+Valid, 7351 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2023-04-02 22:12:28,796 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [381 Valid, 364 Invalid, 7952 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [601 Valid, 7351 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2023-04-02 22:12:28,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 748 states. [2023-04-02 22:12:28,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 748 to 746. [2023-04-02 22:12:28,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 746 states, 513 states have (on average 1.0467836257309941) internal successors, (537), 526 states have internal predecessors, (537), 213 states have call successors, (213), 20 states have call predecessors, (213), 19 states have return successors, (212), 199 states have call predecessors, (212), 212 states have call successors, (212) [2023-04-02 22:12:28,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 746 states to 746 states and 962 transitions. [2023-04-02 22:12:28,997 INFO L78 Accepts]: Start accepts. Automaton has 746 states and 962 transitions. Word has length 181 [2023-04-02 22:12:28,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:12:28,997 INFO L495 AbstractCegarLoop]: Abstraction has 746 states and 962 transitions. [2023-04-02 22:12:28,997 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 122 states, 121 states have (on average 1.578512396694215) internal successors, (191), 120 states have internal predecessors, (191), 65 states have call successors, (67), 3 states have call predecessors, (67), 1 states have return successors, (64), 64 states have call predecessors, (64), 64 states have call successors, (64) [2023-04-02 22:12:28,997 INFO L276 IsEmpty]: Start isEmpty. Operand 746 states and 962 transitions. [2023-04-02 22:12:29,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2023-04-02 22:12:29,000 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:12:29,000 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:12:29,021 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2023-04-02 22:12:29,205 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2023-04-02 22:12:29,205 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:12:29,206 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:12:29,206 INFO L85 PathProgramCache]: Analyzing trace with hash 219290566, now seen corresponding path program 26 times [2023-04-02 22:12:29,206 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:12:29,206 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518175271] [2023-04-02 22:12:29,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:12:29,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:12:29,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:12:31,427 INFO L134 CoverageAnalysis]: Checked inductivity of 1981 backedges. 695 proven. 362 refuted. 0 times theorem prover too weak. 924 trivial. 0 not checked. [2023-04-02 22:12:31,427 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:12:31,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518175271] [2023-04-02 22:12:31,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [518175271] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:12:31,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [388422353] [2023-04-02 22:12:31,427 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:12:31,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:12:31,427 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:12:31,428 INFO L229 MonitoredProcess]: Starting monitored process 30 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:12:31,458 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2023-04-02 22:12:31,543 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2023-04-02 22:12:31,543 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:12:31,545 INFO L262 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 106 conjunts are in the unsatisfiable core [2023-04-02 22:12:31,563 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:12:34,117 INFO L134 CoverageAnalysis]: Checked inductivity of 1981 backedges. 43 proven. 1077 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2023-04-02 22:12:34,118 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:12:38,066 INFO L134 CoverageAnalysis]: Checked inductivity of 1981 backedges. 43 proven. 1077 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2023-04-02 22:12:38,067 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [388422353] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:12:38,067 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1553274347] [2023-04-02 22:12:38,067 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 22:12:38,067 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:12:38,068 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:12:38,068 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:12:38,068 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:12:38,074 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 9 for LOIs [2023-04-02 22:12:38,294 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 22:12:38,302 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 22:12:38,304 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:12:40,149 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '52354#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:12:40,150 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:12:40,150 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 22:12:40,150 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 54, 54] total 151 [2023-04-02 22:12:40,150 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443376658] [2023-04-02 22:12:40,150 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 22:12:40,150 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 151 states [2023-04-02 22:12:40,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:12:40,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 151 interpolants. [2023-04-02 22:12:40,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2974, Invalid=23432, Unknown=0, NotChecked=0, Total=26406 [2023-04-02 22:12:40,152 INFO L87 Difference]: Start difference. First operand 746 states and 962 transitions. Second operand has 151 states, 150 states have (on average 1.5) internal successors, (225), 149 states have internal predecessors, (225), 68 states have call successors, (70), 3 states have call predecessors, (70), 2 states have return successors, (67), 67 states have call predecessors, (67), 67 states have call successors, (67) [2023-04-02 22:12:52,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:12:52,852 INFO L93 Difference]: Finished difference Result 956 states and 1203 transitions. [2023-04-02 22:12:52,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 127 states. [2023-04-02 22:12:52,852 INFO L78 Accepts]: Start accepts. Automaton has has 151 states, 150 states have (on average 1.5) internal successors, (225), 149 states have internal predecessors, (225), 68 states have call successors, (70), 3 states have call predecessors, (70), 2 states have return successors, (67), 67 states have call predecessors, (67), 67 states have call successors, (67) Word has length 189 [2023-04-02 22:12:52,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:12:52,855 INFO L225 Difference]: With dead ends: 956 [2023-04-02 22:12:52,855 INFO L226 Difference]: Without dead ends: 818 [2023-04-02 22:12:52,857 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 693 GetRequests, 457 SyntacticMatches, 1 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18356 ImplicationChecksByTransitivity, 17.6s TimeCoverageRelationStatistics Valid=7238, Invalid=48694, Unknown=0, NotChecked=0, Total=55932 [2023-04-02 22:12:52,858 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 412 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 7510 mSolverCounterSat, 688 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 412 SdHoareTripleChecker+Valid, 301 SdHoareTripleChecker+Invalid, 8198 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 688 IncrementalHoareTripleChecker+Valid, 7510 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:12:52,858 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [412 Valid, 301 Invalid, 8198 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [688 Valid, 7510 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2023-04-02 22:12:52,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 818 states. [2023-04-02 22:12:53,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 818 to 818. [2023-04-02 22:12:53,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 818 states, 562 states have (on average 1.0444839857651245) internal successors, (587), 575 states have internal predecessors, (587), 235 states have call successors, (235), 21 states have call predecessors, (235), 20 states have return successors, (234), 221 states have call predecessors, (234), 234 states have call successors, (234) [2023-04-02 22:12:53,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 818 states to 818 states and 1056 transitions. [2023-04-02 22:12:53,077 INFO L78 Accepts]: Start accepts. Automaton has 818 states and 1056 transitions. Word has length 189 [2023-04-02 22:12:53,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:12:53,077 INFO L495 AbstractCegarLoop]: Abstraction has 818 states and 1056 transitions. [2023-04-02 22:12:53,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 151 states, 150 states have (on average 1.5) internal successors, (225), 149 states have internal predecessors, (225), 68 states have call successors, (70), 3 states have call predecessors, (70), 2 states have return successors, (67), 67 states have call predecessors, (67), 67 states have call successors, (67) [2023-04-02 22:12:53,078 INFO L276 IsEmpty]: Start isEmpty. Operand 818 states and 1056 transitions. [2023-04-02 22:12:53,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2023-04-02 22:12:53,080 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:12:53,080 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:12:53,085 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2023-04-02 22:12:53,280 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,30 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:12:53,280 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:12:53,281 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:12:53,281 INFO L85 PathProgramCache]: Analyzing trace with hash 1067211705, now seen corresponding path program 27 times [2023-04-02 22:12:53,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:12:53,281 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907410153] [2023-04-02 22:12:53,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:12:53,281 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:12:53,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:12:55,699 INFO L134 CoverageAnalysis]: Checked inductivity of 2163 backedges. 761 proven. 390 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2023-04-02 22:12:55,699 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:12:55,699 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1907410153] [2023-04-02 22:12:55,699 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1907410153] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:12:55,699 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449818070] [2023-04-02 22:12:55,699 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:12:55,699 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:12:55,699 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:12:55,700 INFO L229 MonitoredProcess]: Starting monitored process 31 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 22:12:55,702 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2023-04-02 22:12:55,781 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:12:55,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:12:55,783 INFO L262 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 104 conjunts are in the unsatisfiable core [2023-04-02 22:12:55,786 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:12:57,327 INFO L134 CoverageAnalysis]: Checked inductivity of 2163 backedges. 46 proven. 1105 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2023-04-02 22:12:57,327 INFO L327 TraceCheckSpWp]: Computing backward predicates...