/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/array-multidimensional/min-2-u.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 15:03:05,441 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 15:03:05,442 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 15:03:05,478 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 15:03:05,478 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 15:03:05,481 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 15:03:05,485 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 15:03:05,487 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 15:03:05,488 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 15:03:05,492 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 15:03:05,493 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 15:03:05,494 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 15:03:05,494 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 15:03:05,502 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 15:03:05,503 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 15:03:05,503 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 15:03:05,504 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 15:03:05,504 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 15:03:05,506 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 15:03:05,510 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 15:03:05,511 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 15:03:05,512 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 15:03:05,513 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 15:03:05,513 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 15:03:05,518 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 15:03:05,518 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 15:03:05,518 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 15:03:05,519 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 15:03:05,520 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 15:03:05,520 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 15:03:05,520 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 15:03:05,521 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 15:03:05,522 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 15:03:05,522 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 15:03:05,522 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 15:03:05,522 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 15:03:05,523 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 15:03:05,523 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 15:03:05,523 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 15:03:05,523 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 15:03:05,524 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 15:03:05,525 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 15:03:05,546 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 15:03:05,547 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 15:03:05,547 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 15:03:05,547 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 15:03:05,548 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 15:03:05,548 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 15:03:05,548 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 15:03:05,548 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 15:03:05,548 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 15:03:05,548 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 15:03:05,549 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 15:03:05,549 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 15:03:05,549 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 15:03:05,549 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 15:03:05,549 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 15:03:05,549 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 15:03:05,549 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 15:03:05,549 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 15:03:05,550 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 15:03:05,550 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 15:03:05,550 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 15:03:05,550 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 15:03:05,550 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 15:03:05,550 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 15:03:05,550 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 15:03:05,550 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 15:03:05,550 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 15:03:05,550 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 15:03:05,550 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 15:03:05,551 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 15:03:05,551 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 15:03:05,551 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 15:03:05,551 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:03:05,551 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 15:03:05,551 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 15:03:05,551 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 15:03:05,551 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 15:03:05,551 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 15:03:05,551 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 15:03:05,551 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 15:03:05,552 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 15:03:05,552 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 15:03:05,718 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 15:03:05,732 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 15:03:05,734 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 15:03:05,735 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 15:03:05,735 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 15:03:05,735 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-multidimensional/min-2-u.c [2023-04-02 15:03:06,799 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 15:03:06,954 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 15:03:06,954 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-multidimensional/min-2-u.c [2023-04-02 15:03:06,958 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70fec0887/816de4903a504205b4d546fb4092332f/FLAG41f2e7190 [2023-04-02 15:03:06,971 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/70fec0887/816de4903a504205b4d546fb4092332f [2023-04-02 15:03:06,973 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 15:03:06,974 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 15:03:06,976 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 15:03:06,976 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 15:03:06,978 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 15:03:06,979 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:03:06" (1/1) ... [2023-04-02 15:03:06,980 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3639275b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:03:06, skipping insertion in model container [2023-04-02 15:03:06,980 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:03:06" (1/1) ... [2023-04-02 15:03:06,984 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 15:03:06,998 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 15:03:07,127 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-multidimensional/min-2-u.c[319,332] [2023-04-02 15:03:07,149 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:03:07,157 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 15:03:07,166 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-multidimensional/min-2-u.c[319,332] [2023-04-02 15:03:07,174 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:03:07,187 INFO L208 MainTranslator]: Completed translation [2023-04-02 15:03:07,187 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:03:07 WrapperNode [2023-04-02 15:03:07,187 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 15:03:07,189 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 15:03:07,189 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 15:03:07,189 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 15:03:07,198 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:03:07" (1/1) ... [2023-04-02 15:03:07,198 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:03:07" (1/1) ... [2023-04-02 15:03:07,205 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:03:07" (1/1) ... [2023-04-02 15:03:07,206 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:03:07" (1/1) ... [2023-04-02 15:03:07,219 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:03:07" (1/1) ... [2023-04-02 15:03:07,225 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:03:07" (1/1) ... [2023-04-02 15:03:07,226 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:03:07" (1/1) ... [2023-04-02 15:03:07,227 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:03:07" (1/1) ... [2023-04-02 15:03:07,228 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 15:03:07,229 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 15:03:07,229 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 15:03:07,229 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 15:03:07,230 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:03:07" (1/1) ... [2023-04-02 15:03:07,237 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:03:07,245 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:03:07,260 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 15:03:07,262 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 15:03:07,304 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 15:03:07,304 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 15:03:07,304 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 15:03:07,309 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 15:03:07,309 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 15:03:07,309 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 15:03:07,309 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 15:03:07,309 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 15:03:07,309 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 15:03:07,309 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 15:03:07,309 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 15:03:07,309 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 15:03:07,310 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 15:03:07,310 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 15:03:07,310 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 15:03:07,310 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 15:03:07,310 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 15:03:07,310 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 15:03:07,311 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 15:03:07,367 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 15:03:07,370 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 15:03:07,555 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 15:03:07,605 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 15:03:07,605 INFO L302 CfgBuilder]: Removed 6 assume(true) statements. [2023-04-02 15:03:07,607 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:03:07 BoogieIcfgContainer [2023-04-02 15:03:07,607 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 15:03:07,608 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 15:03:07,608 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 15:03:07,610 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 15:03:07,610 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 03:03:06" (1/3) ... [2023-04-02 15:03:07,611 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e57d20f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:03:07, skipping insertion in model container [2023-04-02 15:03:07,611 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:03:07" (2/3) ... [2023-04-02 15:03:07,611 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e57d20f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:03:07, skipping insertion in model container [2023-04-02 15:03:07,611 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:03:07" (3/3) ... [2023-04-02 15:03:07,612 INFO L112 eAbstractionObserver]: Analyzing ICFG min-2-u.c [2023-04-02 15:03:07,627 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 15:03:07,628 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 15:03:07,688 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 15:03:07,694 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;@2c444ed8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 15:03:07,694 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 15:03:07,698 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 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 15:03:07,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-04-02 15:03:07,704 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:03:07,705 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:03:07,705 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:03:07,711 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:03:07,711 INFO L85 PathProgramCache]: Analyzing trace with hash 952310166, now seen corresponding path program 1 times [2023-04-02 15:03:07,719 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:03:07,720 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [343827449] [2023-04-02 15:03:07,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:03:07,720 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:03:07,796 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:03:07,797 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [9860404] [2023-04-02 15:03:07,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:03:07,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:03:07,797 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:03:07,800 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 15:03:07,801 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 15:03:07,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:03:07,872 INFO L262 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-02 15:03:07,876 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:03:07,972 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 15:03:07,972 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 15:03:07,973 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:03:07,973 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [343827449] [2023-04-02 15:03:07,973 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:03:07,973 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [9860404] [2023-04-02 15:03:07,974 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [9860404] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:03:07,974 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 15:03:07,974 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 15:03:07,976 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984923769] [2023-04-02 15:03:07,976 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:03:07,979 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 15:03:07,980 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:03:08,018 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 15:03:08,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 15:03:08,021 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:03:08,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:03:08,073 INFO L93 Difference]: Finished difference Result 39 states and 52 transitions. [2023-04-02 15:03:08,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 15:03:08,077 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-04-02 15:03:08,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:03:08,082 INFO L225 Difference]: With dead ends: 39 [2023-04-02 15:03:08,082 INFO L226 Difference]: Without dead ends: 21 [2023-04-02 15:03:08,084 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 15:03:08,087 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 2 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:03:08,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 30 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:03:08,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-04-02 15:03:08,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2023-04-02 15:03:08,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 14 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:03:08,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2023-04-02 15:03:08,120 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 13 [2023-04-02 15:03:08,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:03:08,120 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2023-04-02 15:03:08,120 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:03:08,120 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2023-04-02 15:03:08,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-02 15:03:08,121 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:03:08,121 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:03:08,128 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-02 15:03:08,326 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-04-02 15:03:08,327 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:03:08,328 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:03:08,328 INFO L85 PathProgramCache]: Analyzing trace with hash 749911015, now seen corresponding path program 1 times [2023-04-02 15:03:08,328 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:03:08,329 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [658331328] [2023-04-02 15:03:08,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:03:08,329 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:03:08,340 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:03:08,341 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1651484899] [2023-04-02 15:03:08,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:03:08,341 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:03:08,341 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:03:08,356 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 15:03:08,358 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 15:03:08,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:03:08,399 INFO L262 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-02 15:03:08,400 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:03:08,417 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:03:08,417 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 15:03:08,417 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:03:08,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [658331328] [2023-04-02 15:03:08,417 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:03:08,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651484899] [2023-04-02 15:03:08,418 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651484899] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:03:08,418 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 15:03:08,418 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-02 15:03:08,418 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265851814] [2023-04-02 15:03:08,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:03:08,419 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 15:03:08,419 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:03:08,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 15:03:08,420 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-02 15:03:08,420 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 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 15:03:08,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:03:08,481 INFO L93 Difference]: Finished difference Result 41 states and 56 transitions. [2023-04-02 15:03:08,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 15:03:08,482 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 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 15 [2023-04-02 15:03:08,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:03:08,483 INFO L225 Difference]: With dead ends: 41 [2023-04-02 15:03:08,484 INFO L226 Difference]: Without dead ends: 27 [2023-04-02 15:03:08,484 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-04-02 15:03:08,485 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 11 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:03:08,485 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 30 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:03:08,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-04-02 15:03:08,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2023-04-02 15:03:08,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 17 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:03:08,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2023-04-02 15:03:08,493 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 15 [2023-04-02 15:03:08,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:03:08,493 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2023-04-02 15:03:08,493 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 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 15:03:08,494 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2023-04-02 15:03:08,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-04-02 15:03:08,494 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:03:08,494 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:03:08,505 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 15:03:08,695 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-04-02 15:03:08,695 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:03:08,696 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:03:08,696 INFO L85 PathProgramCache]: Analyzing trace with hash -751525547, now seen corresponding path program 1 times [2023-04-02 15:03:08,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:03:08,696 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338159817] [2023-04-02 15:03:08,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:03:08,696 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:03:08,705 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:03:08,706 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [464345958] [2023-04-02 15:03:08,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:03:08,706 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:03:08,706 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:03:08,707 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 15:03:08,721 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 15:03:08,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:03:08,796 INFO L262 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 15:03:08,797 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:03:08,862 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:03:08,863 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:03:08,906 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:03:08,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:03:08,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338159817] [2023-04-02 15:03:08,907 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:03:08,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464345958] [2023-04-02 15:03:08,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464345958] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:03:08,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [482005372] [2023-04-02 15:03:08,919 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-04-02 15:03:08,919 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:03:08,921 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:03:08,937 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:03:08,938 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:03:09,054 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:03:09,354 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:03:09,359 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:03:09,526 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [482005372] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:03:09,527 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:03:09,527 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [5, 5] total 15 [2023-04-02 15:03:09,527 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818477044] [2023-04-02 15:03:09,528 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:03:09,528 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-02 15:03:09,528 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:03:09,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-02 15:03:09,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=155, Unknown=0, NotChecked=0, Total=210 [2023-04-02 15:03:09,530 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand has 9 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (3), 3 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 15:03:10,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:03:10,063 INFO L93 Difference]: Finished difference Result 44 states and 55 transitions. [2023-04-02 15:03:10,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-04-02 15:03:10,063 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (3), 3 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 16 [2023-04-02 15:03:10,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:03:10,066 INFO L225 Difference]: With dead ends: 44 [2023-04-02 15:03:10,066 INFO L226 Difference]: Without dead ends: 33 [2023-04-02 15:03:10,066 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=121, Invalid=341, Unknown=0, NotChecked=0, Total=462 [2023-04-02 15:03:10,071 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 63 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:03:10,075 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 6 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:03:10,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-04-02 15:03:10,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 24. [2023-04-02 15:03:10,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.3333333333333333) internal successors, (24), 18 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:03:10,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2023-04-02 15:03:10,091 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 16 [2023-04-02 15:03:10,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:03:10,091 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2023-04-02 15:03:10,091 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 6 states have (on average 2.0) internal successors, (12), 5 states have internal predecessors, (12), 3 states have call successors, (3), 3 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 15:03:10,091 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2023-04-02 15:03:10,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-02 15:03:10,092 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:03:10,092 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:03:10,097 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 15:03:10,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:03:10,297 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:03:10,298 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:03:10,298 INFO L85 PathProgramCache]: Analyzing trace with hash 2074201408, now seen corresponding path program 1 times [2023-04-02 15:03:10,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:03:10,298 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136898045] [2023-04-02 15:03:10,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:03:10,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:03:10,308 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:03:10,308 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [798902769] [2023-04-02 15:03:10,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:03:10,308 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:03:10,308 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:03:10,324 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 15:03:10,325 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 15:03:10,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:03:10,418 INFO L262 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 15:03:10,419 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:03:10,436 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 15:03:10,436 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:03:10,467 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-04-02 15:03:10,467 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:03:10,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136898045] [2023-04-02 15:03:10,467 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:03:10,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [798902769] [2023-04-02 15:03:10,467 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [798902769] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:03:10,467 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1283953863] [2023-04-02 15:03:10,469 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 15:03:10,469 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:03:10,469 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:03:10,469 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:03:10,469 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:03:10,498 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:03:10,807 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:03:10,821 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:03:10,824 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:03:13,381 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '665#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:03:13,382 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:03:13,382 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:03:13,382 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2023-04-02 15:03:13,382 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730170379] [2023-04-02 15:03:13,382 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:03:13,382 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-02 15:03:13,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:03:13,383 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-02 15:03:13,383 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=293, Unknown=2, NotChecked=0, Total=380 [2023-04-02 15:03:13,383 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 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 15:03:13,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:03:13,463 INFO L93 Difference]: Finished difference Result 58 states and 80 transitions. [2023-04-02 15:03:13,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-02 15:03:13,464 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 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 19 [2023-04-02 15:03:13,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:03:13,464 INFO L225 Difference]: With dead ends: 58 [2023-04-02 15:03:13,464 INFO L226 Difference]: Without dead ends: 40 [2023-04-02 15:03:13,465 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=105, Invalid=355, Unknown=2, NotChecked=0, Total=462 [2023-04-02 15:03:13,465 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 51 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:03:13,466 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 39 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:03:13,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-04-02 15:03:13,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2023-04-02 15:03:13,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 30 states have (on average 1.2) internal successors, (36), 30 states have internal predecessors, (36), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 15:03:13,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2023-04-02 15:03:13,477 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 19 [2023-04-02 15:03:13,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:03:13,478 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2023-04-02 15:03:13,478 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.375) internal successors, (19), 8 states have internal predecessors, (19), 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 15:03:13,478 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2023-04-02 15:03:13,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-02 15:03:13,478 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:03:13,478 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:03:13,493 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-04-02 15:03:13,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:03:13,683 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:03:13,684 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:03:13,684 INFO L85 PathProgramCache]: Analyzing trace with hash 576039764, now seen corresponding path program 2 times [2023-04-02 15:03:13,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:03:13,684 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834115178] [2023-04-02 15:03:13,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:03:13,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:03:13,692 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:03:13,692 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [780781308] [2023-04-02 15:03:13,693 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:03:13,693 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:03:13,693 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:03:13,694 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 15:03:13,696 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 15:03:13,733 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 15:03:13,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:03:13,734 INFO L262 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 15:03:13,735 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:03:13,767 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-02 15:03:13,767 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:03:13,794 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-04-02 15:03:13,794 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:03:13,794 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834115178] [2023-04-02 15:03:13,795 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 15:03:13,795 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780781308] [2023-04-02 15:03:13,795 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [780781308] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:03:13,795 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1813853176] [2023-04-02 15:03:13,796 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-02 15:03:13,796 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:03:13,797 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:03:13,797 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:03:13,797 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:03:13,809 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 15:03:14,025 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:03:14,032 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 15:03:14,035 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:03:14,942 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1004#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:03:14,942 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:03:14,942 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 15:03:14,942 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2023-04-02 15:03:14,942 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105414296] [2023-04-02 15:03:14,942 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 15:03:14,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-02 15:03:14,943 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:03:14,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-02 15:03:14,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=290, Unknown=2, NotChecked=0, Total=380 [2023-04-02 15:03:14,943 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 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 15:03:15,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:03:15,046 INFO L93 Difference]: Finished difference Result 143 states and 183 transitions. [2023-04-02 15:03:15,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-02 15:03:15,047 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 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 25 [2023-04-02 15:03:15,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:03:15,048 INFO L225 Difference]: With dead ends: 143 [2023-04-02 15:03:15,048 INFO L226 Difference]: Without dead ends: 123 [2023-04-02 15:03:15,049 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=349, Unknown=2, NotChecked=0, Total=462 [2023-04-02 15:03:15,049 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 82 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:03:15,049 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 42 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:03:15,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2023-04-02 15:03:15,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 57. [2023-04-02 15:03:15,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 48 states have (on average 1.1875) internal successors, (57), 48 states have internal predecessors, (57), 6 states have call successors, (6), 3 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-02 15:03:15,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 68 transitions. [2023-04-02 15:03:15,068 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 68 transitions. Word has length 25 [2023-04-02 15:03:15,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:03:15,069 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 68 transitions. [2023-04-02 15:03:15,069 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.0) internal successors, (24), 8 states have internal predecessors, (24), 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 15:03:15,069 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 68 transitions. [2023-04-02 15:03:15,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-04-02 15:03:15,069 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:03:15,070 INFO L195 NwaCegarLoop]: trace histogram [16, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:03:15,076 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 15:03:15,274 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:03:15,275 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:03:15,275 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:03:15,275 INFO L85 PathProgramCache]: Analyzing trace with hash 1246270619, now seen corresponding path program 3 times [2023-04-02 15:03:15,275 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:03:15,275 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131735744] [2023-04-02 15:03:15,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:03:15,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:03:15,300 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 15:03:15,300 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1358601781] [2023-04-02 15:03:15,300 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:03:15,300 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:03:15,300 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:03:15,317 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 15:03:15,356 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 15:03:15,402 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:03:15,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:03:15,404 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 32 conjunts are in the unsatisfiable core [2023-04-02 15:03:15,407 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:03:36,659 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-04-02 15:03:36,677 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 36 proven. 71 refuted. 27 times theorem prover too weak. 77 trivial. 0 not checked. [2023-04-02 15:03:36,677 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:04:17,062 WARN L223 SmtUtils]: Spent 25.76s on a formula simplification. DAG size of input: 92 DAG size of output: 88 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 15:05:46,805 WARN L223 SmtUtils]: Spent 1.35m on a formula simplification. DAG size of input: 166 DAG size of output: 112 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 15:07:36,438 WARN L223 SmtUtils]: Spent 1.58m on a formula simplification. DAG size of input: 202 DAG size of output: 139 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate)