/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/nla-digbench-scaling/cohencu-ll_unwindbound20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 22:36:34,458 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 22:36:34,460 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 22:36:34,491 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 22:36:34,491 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 22:36:34,493 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 22:36:34,495 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 22:36:34,497 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 22:36:34,498 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 22:36:34,502 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 22:36:34,503 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 22:36:34,504 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 22:36:34,505 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 22:36:34,506 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 22:36:34,507 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 22:36:34,508 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 22:36:34,508 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 22:36:34,509 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 22:36:34,510 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 22:36:34,514 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 22:36:34,515 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 22:36:34,515 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 22:36:34,516 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 22:36:34,517 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 22:36:34,523 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 22:36:34,523 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 22:36:34,523 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 22:36:34,524 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 22:36:34,524 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 22:36:34,525 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 22:36:34,525 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 22:36:34,525 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 22:36:34,526 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 22:36:34,527 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 22:36:34,527 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 22:36:34,527 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 22:36:34,528 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 22:36:34,528 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 22:36:34,528 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 22:36:34,529 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 22:36:34,529 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 22:36:34,530 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 22:36:34,552 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 22:36:34,552 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 22:36:34,553 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 22:36:34,553 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 22:36:34,553 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 22:36:34,553 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 22:36:34,554 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 22:36:34,554 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 22:36:34,554 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 22:36:34,554 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 22:36:34,555 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 22:36:34,555 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 22:36:34,555 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 22:36:34,555 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 22:36:34,555 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 22:36:34,555 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 22:36:34,555 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 22:36:34,555 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 22:36:34,556 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 22:36:34,556 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 22:36:34,556 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 22:36:34,556 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 22:36:34,556 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 22:36:34,556 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 22:36:34,556 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 22:36:34,556 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 22:36:34,556 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 22:36:34,557 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 22:36:34,557 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 22:36:34,557 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 22:36:34,557 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 22:36:34,557 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 22:36:34,557 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:36:34,557 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 22:36:34,557 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 22:36:34,557 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 22:36:34,558 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 22:36:34,558 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 22:36:34,558 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 22:36:34,558 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 22:36:34,558 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 22:36:34,558 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 22:36:34,750 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 22:36:34,761 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 22:36:34,762 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 22:36:34,763 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 22:36:34,764 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 22:36:34,764 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound20.c [2023-04-02 22:36:35,685 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 22:36:35,875 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 22:36:35,876 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound20.c [2023-04-02 22:36:35,880 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e5e6c4d3b/8c2109b4047345e7a5de81941f42e1f9/FLAGe06b5a70f [2023-04-02 22:36:35,889 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e5e6c4d3b/8c2109b4047345e7a5de81941f42e1f9 [2023-04-02 22:36:35,890 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 22:36:35,891 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 22:36:35,892 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 22:36:35,892 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 22:36:35,894 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 22:36:35,895 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:36:35" (1/1) ... [2023-04-02 22:36:35,895 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ec280b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:36:35, skipping insertion in model container [2023-04-02 22:36:35,896 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 10:36:35" (1/1) ... [2023-04-02 22:36:35,900 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 22:36:35,909 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 22:36:35,992 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound20.c[588,601] [2023-04-02 22:36:36,014 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:36:36,021 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 22:36:36,028 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound20.c[588,601] [2023-04-02 22:36:36,035 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 22:36:36,043 INFO L208 MainTranslator]: Completed translation [2023-04-02 22:36:36,044 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:36:36 WrapperNode [2023-04-02 22:36:36,047 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 22:36:36,048 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 22:36:36,048 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 22:36:36,048 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 22:36:36,070 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:36:36" (1/1) ... [2023-04-02 22:36:36,070 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:36:36" (1/1) ... [2023-04-02 22:36:36,078 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:36:36" (1/1) ... [2023-04-02 22:36:36,078 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:36:36" (1/1) ... [2023-04-02 22:36:36,081 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:36:36" (1/1) ... [2023-04-02 22:36:36,083 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:36:36" (1/1) ... [2023-04-02 22:36:36,083 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:36:36" (1/1) ... [2023-04-02 22:36:36,084 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:36:36" (1/1) ... [2023-04-02 22:36:36,085 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 22:36:36,085 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 22:36:36,085 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 22:36:36,085 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 22:36:36,086 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:36:36" (1/1) ... [2023-04-02 22:36:36,105 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 22:36:36,114 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:36:36,134 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 22:36:36,142 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 22:36:36,163 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 22:36:36,163 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 22:36:36,163 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 22:36:36,164 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2023-04-02 22:36:36,164 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 22:36:36,164 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 22:36:36,164 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 22:36:36,165 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 22:36:36,165 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 22:36:36,165 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 22:36:36,165 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_ushort [2023-04-02 22:36:36,165 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2023-04-02 22:36:36,165 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 22:36:36,165 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 22:36:36,165 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 22:36:36,165 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 22:36:36,165 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 22:36:36,165 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 22:36:36,166 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 22:36:36,166 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 22:36:36,215 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 22:36:36,217 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 22:36:36,381 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 22:36:36,395 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 22:36:36,395 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-02 22:36:36,411 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:36:36 BoogieIcfgContainer [2023-04-02 22:36:36,411 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 22:36:36,412 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 22:36:36,413 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 22:36:36,415 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 22:36:36,415 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 10:36:35" (1/3) ... [2023-04-02 22:36:36,415 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d549b04 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:36:36, skipping insertion in model container [2023-04-02 22:36:36,415 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 10:36:36" (2/3) ... [2023-04-02 22:36:36,415 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d549b04 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 10:36:36, skipping insertion in model container [2023-04-02 22:36:36,415 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 10:36:36" (3/3) ... [2023-04-02 22:36:36,416 INFO L112 eAbstractionObserver]: Analyzing ICFG cohencu-ll_unwindbound20.c [2023-04-02 22:36:36,441 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 22:36:36,441 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 22:36:36,478 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 22:36:36,482 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;@1e7db8ec, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 22:36:36,482 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 22:36:36,485 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2023-04-02 22:36:36,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-04-02 22:36:36,489 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:36:36,489 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:36:36,490 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:36:36,493 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:36:36,493 INFO L85 PathProgramCache]: Analyzing trace with hash -1647932821, now seen corresponding path program 1 times [2023-04-02 22:36:36,498 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:36:36,498 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917578511] [2023-04-02 22:36:36,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:36,499 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:36:36,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:36:36,583 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 22:36:36,584 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:36:36,584 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917578511] [2023-04-02 22:36:36,584 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917578511] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:36:36,585 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:36:36,585 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-04-02 22:36:36,586 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019555044] [2023-04-02 22:36:36,586 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:36:36,588 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-04-02 22:36:36,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:36:36,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-04-02 22:36:36,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-02 22:36:36,606 INFO L87 Difference]: Start difference. First operand has 29 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Second operand has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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 22:36:36,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:36:36,623 INFO L93 Difference]: Finished difference Result 53 states and 90 transitions. [2023-04-02 22:36:36,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-04-02 22:36:36,624 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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 10 [2023-04-02 22:36:36,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:36:36,628 INFO L225 Difference]: With dead ends: 53 [2023-04-02 22:36:36,628 INFO L226 Difference]: Without dead ends: 25 [2023-04-02 22:36:36,630 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-04-02 22:36:36,632 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:36:36,632 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:36:36,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-04-02 22:36:36,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-04-02 22:36:36,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 13 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-04-02 22:36:36,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 36 transitions. [2023-04-02 22:36:36,659 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 36 transitions. Word has length 10 [2023-04-02 22:36:36,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:36:36,659 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 36 transitions. [2023-04-02 22:36:36,660 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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 22:36:36,660 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 36 transitions. [2023-04-02 22:36:36,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-04-02 22:36:36,660 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:36:36,660 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:36:36,660 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 22:36:36,661 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:36:36,661 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:36:36,661 INFO L85 PathProgramCache]: Analyzing trace with hash -78558798, now seen corresponding path program 1 times [2023-04-02 22:36:36,661 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:36:36,661 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975178449] [2023-04-02 22:36:36,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:36,662 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:36:36,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:36:36,771 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 22:36:36,771 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:36:36,772 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975178449] [2023-04-02 22:36:36,772 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1975178449] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:36:36,772 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:36:36,772 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-04-02 22:36:36,772 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619396393] [2023-04-02 22:36:36,772 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:36:36,773 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 22:36:36,773 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:36:36,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 22:36:36,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-02 22:36:36,777 INFO L87 Difference]: Start difference. First operand 25 states and 36 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 22:36:36,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:36:36,802 INFO L93 Difference]: Finished difference Result 39 states and 55 transitions. [2023-04-02 22:36:36,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 22:36:36,805 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 11 [2023-04-02 22:36:36,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:36:36,805 INFO L225 Difference]: With dead ends: 39 [2023-04-02 22:36:36,806 INFO L226 Difference]: Without dead ends: 27 [2023-04-02 22:36:36,806 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-04-02 22:36:36,807 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 0 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:36:36,807 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 95 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:36:36,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-04-02 22:36:36,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-04-02 22:36:36,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 13 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-04-02 22:36:36,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 38 transitions. [2023-04-02 22:36:36,813 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 38 transitions. Word has length 11 [2023-04-02 22:36:36,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:36:36,814 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 38 transitions. [2023-04-02 22:36:36,814 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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 22:36:36,814 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 38 transitions. [2023-04-02 22:36:36,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-04-02 22:36:36,814 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:36:36,814 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:36:36,814 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-02 22:36:36,815 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:36:36,815 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:36:36,815 INFO L85 PathProgramCache]: Analyzing trace with hash -77009666, now seen corresponding path program 1 times [2023-04-02 22:36:36,815 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:36:36,815 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381306033] [2023-04-02 22:36:36,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:36,816 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:36:36,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:36:36,954 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 22:36:36,954 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:36:36,954 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381306033] [2023-04-02 22:36:36,954 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1381306033] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:36:36,954 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 22:36:36,954 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 22:36:36,954 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038941907] [2023-04-02 22:36:36,955 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:36:36,955 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 22:36:36,955 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:36:36,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 22:36:36,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-02 22:36:36,956 INFO L87 Difference]: Start difference. First operand 27 states and 38 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 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 22:36:37,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:36:37,020 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2023-04-02 22:36:37,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 22:36:37,020 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 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 11 [2023-04-02 22:36:37,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:36:37,021 INFO L225 Difference]: With dead ends: 33 [2023-04-02 22:36:37,021 INFO L226 Difference]: Without dead ends: 31 [2023-04-02 22:36:37,021 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-04-02 22:36:37,022 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 8 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 22:36:37,023 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 70 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 22:36:37,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-04-02 22:36:37,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2023-04-02 22:36:37,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 13 states have call successors, (13), 4 states have call predecessors, (13), 3 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-04-02 22:36:37,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 41 transitions. [2023-04-02 22:36:37,032 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 41 transitions. Word has length 11 [2023-04-02 22:36:37,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:36:37,033 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 41 transitions. [2023-04-02 22:36:37,033 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 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 22:36:37,033 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 41 transitions. [2023-04-02 22:36:37,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-04-02 22:36:37,033 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:36:37,033 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:36:37,033 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-02 22:36:37,034 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:36:37,034 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:36:37,034 INFO L85 PathProgramCache]: Analyzing trace with hash 1662799058, now seen corresponding path program 1 times [2023-04-02 22:36:37,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:36:37,034 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [100228025] [2023-04-02 22:36:37,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:37,034 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:36:37,057 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:36:37,057 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1649534653] [2023-04-02 22:36:37,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:37,057 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:37,058 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:36:37,061 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 22:36:37,082 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 22:36:37,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:36:37,101 INFO L262 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 17 conjunts are in the unsatisfiable core [2023-04-02 22:36:37,104 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:36:37,191 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 22:36:37,191 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:36:37,368 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 22:36:37,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:36:37,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [100228025] [2023-04-02 22:36:37,368 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:36:37,368 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1649534653] [2023-04-02 22:36:37,369 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1649534653] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:36:37,371 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [851338042] [2023-04-02 22:36:37,390 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-04-02 22:36:37,390 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:36:37,393 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:36:37,396 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:36:37,396 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:36:37,470 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:36:37,691 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 13 for LOIs [2023-04-02 22:36:37,696 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:36:37,701 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:36:37,960 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [851338042] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 22:36:37,961 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:36:37,961 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [8, 7] total 22 [2023-04-02 22:36:37,964 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831174189] [2023-04-02 22:36:37,964 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 22:36:37,965 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-04-02 22:36:37,965 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:36:37,965 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-04-02 22:36:37,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=377, Unknown=0, NotChecked=0, Total=462 [2023-04-02 22:36:37,967 INFO L87 Difference]: Start difference. First operand 31 states and 41 transitions. Second operand has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:36:38,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:36:38,382 INFO L93 Difference]: Finished difference Result 53 states and 72 transitions. [2023-04-02 22:36:38,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 22:36:38,383 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 16 [2023-04-02 22:36:38,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:36:38,383 INFO L225 Difference]: With dead ends: 53 [2023-04-02 22:36:38,383 INFO L226 Difference]: Without dead ends: 45 [2023-04-02 22:36:38,384 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=122, Invalid=528, Unknown=0, NotChecked=0, Total=650 [2023-04-02 22:36:38,385 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 14 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:36:38,385 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 36 Invalid, 218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 182 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:36:38,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2023-04-02 22:36:38,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2023-04-02 22:36:38,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 22 states have internal predecessors, (24), 18 states have call successors, (18), 6 states have call predecessors, (18), 5 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2023-04-02 22:36:38,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 58 transitions. [2023-04-02 22:36:38,394 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 58 transitions. Word has length 16 [2023-04-02 22:36:38,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:36:38,395 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 58 transitions. [2023-04-02 22:36:38,395 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 22:36:38,395 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 58 transitions. [2023-04-02 22:36:38,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-04-02 22:36:38,396 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:36:38,396 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:36:38,412 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 22:36:38,601 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:38,601 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:36:38,601 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:36:38,602 INFO L85 PathProgramCache]: Analyzing trace with hash 1441032967, now seen corresponding path program 1 times [2023-04-02 22:36:38,603 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:36:38,604 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743947076] [2023-04-02 22:36:38,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:38,604 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:36:38,615 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:36:38,615 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [922066745] [2023-04-02 22:36:38,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:38,615 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:38,615 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:36:38,616 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 22:36:38,637 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 22:36:38,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:36:38,663 INFO L262 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-02 22:36:38,665 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:36:38,718 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 30 proven. 2 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-04-02 22:36:38,718 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:36:38,765 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-04-02 22:36:38,766 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:36:38,766 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743947076] [2023-04-02 22:36:38,766 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:36:38,766 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [922066745] [2023-04-02 22:36:38,766 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [922066745] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:36:38,766 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1665867013] [2023-04-02 22:36:38,768 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 22:36:38,768 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:36:38,768 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:36:38,768 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:36:38,768 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:36:38,791 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:36:40,099 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 22:36:40,106 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:36:40,110 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:36:40,561 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '929#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:36:40,562 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:36:40,562 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:36:40,562 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2023-04-02 22:36:40,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033001910] [2023-04-02 22:36:40,562 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:36:40,562 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-02 22:36:40,562 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:36:40,563 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-02 22:36:40,563 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2023-04-02 22:36:40,563 INFO L87 Difference]: Start difference. First operand 45 states and 58 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 6 states have call successors, (16), 5 states have call predecessors, (16), 5 states have return successors, (14), 5 states have call predecessors, (14), 4 states have call successors, (14) [2023-04-02 22:36:40,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:36:40,733 INFO L93 Difference]: Finished difference Result 111 states and 148 transitions. [2023-04-02 22:36:40,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 22:36:40,733 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 6 states have call successors, (16), 5 states have call predecessors, (16), 5 states have return successors, (14), 5 states have call predecessors, (14), 4 states have call successors, (14) Word has length 44 [2023-04-02 22:36:40,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:36:40,734 INFO L225 Difference]: With dead ends: 111 [2023-04-02 22:36:40,735 INFO L226 Difference]: Without dead ends: 95 [2023-04-02 22:36:40,735 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=88, Invalid=464, Unknown=0, NotChecked=0, Total=552 [2023-04-02 22:36:40,736 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 51 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:36:40,736 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 147 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:36:40,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-04-02 22:36:40,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 91. [2023-04-02 22:36:40,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 41 states have (on average 1.170731707317073) internal successors, (48), 44 states have internal predecessors, (48), 40 states have call successors, (40), 10 states have call predecessors, (40), 9 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) [2023-04-02 22:36:40,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 124 transitions. [2023-04-02 22:36:40,774 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 124 transitions. Word has length 44 [2023-04-02 22:36:40,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:36:40,774 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 124 transitions. [2023-04-02 22:36:40,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 6 states have call successors, (16), 5 states have call predecessors, (16), 5 states have return successors, (14), 5 states have call predecessors, (14), 4 states have call successors, (14) [2023-04-02 22:36:40,774 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 124 transitions. [2023-04-02 22:36:40,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-04-02 22:36:40,775 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:36:40,775 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:36:40,780 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-04-02 22:36:40,975 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:40,976 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:36:40,976 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:36:40,976 INFO L85 PathProgramCache]: Analyzing trace with hash 1933148283, now seen corresponding path program 1 times [2023-04-02 22:36:40,976 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:36:40,976 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1085880317] [2023-04-02 22:36:40,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:40,976 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:36:40,984 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:36:40,984 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [58961206] [2023-04-02 22:36:40,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:40,984 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:40,984 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:36:41,005 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 22:36:41,006 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 22:36:41,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:36:41,044 INFO L262 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 21 conjunts are in the unsatisfiable core [2023-04-02 22:36:41,045 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:36:41,115 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 11 proven. 20 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-02 22:36:41,115 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:36:41,214 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 14 proven. 17 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-04-02 22:36:41,214 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:36:41,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1085880317] [2023-04-02 22:36:41,214 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:36:41,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58961206] [2023-04-02 22:36:41,214 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58961206] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:36:41,215 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1417777761] [2023-04-02 22:36:41,216 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 22:36:41,216 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:36:41,216 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:36:41,216 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:36:41,216 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:36:41,230 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:36:41,978 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 22:36:41,984 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:36:41,986 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:36:42,372 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1542#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:36:42,372 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:36:42,372 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:36:42,372 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2023-04-02 22:36:42,372 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204205208] [2023-04-02 22:36:42,372 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:36:42,373 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-02 22:36:42,373 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:36:42,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-02 22:36:42,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=522, Unknown=0, NotChecked=0, Total=600 [2023-04-02 22:36:42,373 INFO L87 Difference]: Start difference. First operand 91 states and 124 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 6 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (13), 5 states have call predecessors, (13), 6 states have call successors, (13) [2023-04-02 22:36:42,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:36:42,669 INFO L93 Difference]: Finished difference Result 109 states and 140 transitions. [2023-04-02 22:36:42,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-02 22:36:42,669 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 6 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (13), 5 states have call predecessors, (13), 6 states have call successors, (13) Word has length 44 [2023-04-02 22:36:42,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:36:42,670 INFO L225 Difference]: With dead ends: 109 [2023-04-02 22:36:42,670 INFO L226 Difference]: Without dead ends: 107 [2023-04-02 22:36:42,671 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 105 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=108, Invalid=704, Unknown=0, NotChecked=0, Total=812 [2023-04-02 22:36:42,671 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 23 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 54 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 54 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:36:42,671 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 98 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [54 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:36:42,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2023-04-02 22:36:42,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2023-04-02 22:36:42,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 56 states have internal predecessors, (60), 40 states have call successors, (40), 14 states have call predecessors, (40), 13 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) [2023-04-02 22:36:42,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 136 transitions. [2023-04-02 22:36:42,692 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 136 transitions. Word has length 44 [2023-04-02 22:36:42,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:36:42,692 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 136 transitions. [2023-04-02 22:36:42,692 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 11 states have internal predecessors, (26), 6 states have call successors, (16), 3 states have call predecessors, (16), 2 states have return successors, (13), 5 states have call predecessors, (13), 6 states have call successors, (13) [2023-04-02 22:36:42,692 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 136 transitions. [2023-04-02 22:36:42,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-04-02 22:36:42,693 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:36:42,693 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:36:42,699 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 22:36:42,902 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:42,903 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:36:42,903 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:36:42,903 INFO L85 PathProgramCache]: Analyzing trace with hash -82151627, now seen corresponding path program 2 times [2023-04-02 22:36:42,903 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:36:42,904 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1439231925] [2023-04-02 22:36:42,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:42,904 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:36:42,916 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:36:42,916 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2078745264] [2023-04-02 22:36:42,916 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:36:42,916 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:42,916 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:36:42,929 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 22:36:42,950 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 22:36:42,984 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-04-02 22:36:42,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:36:42,985 INFO L262 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 16 conjunts are in the unsatisfiable core [2023-04-02 22:36:42,988 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:36:43,057 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-04-02 22:36:43,057 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:36:43,113 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2023-04-02 22:36:43,113 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:36:43,113 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1439231925] [2023-04-02 22:36:43,113 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:36:43,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078745264] [2023-04-02 22:36:43,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2078745264] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:36:43,114 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [365084560] [2023-04-02 22:36:43,115 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 22:36:43,115 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:36:43,115 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:36:43,115 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:36:43,116 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:36:43,128 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:36:43,840 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 22:36:43,845 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:36:43,847 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:36:44,214 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2197#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:36:44,214 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:36:44,214 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:36:44,214 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2023-04-02 22:36:44,215 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515486713] [2023-04-02 22:36:44,215 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:36:44,215 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-02 22:36:44,215 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:36:44,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-02 22:36:44,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2023-04-02 22:36:44,216 INFO L87 Difference]: Start difference. First operand 107 states and 136 transitions. Second operand has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (18), 3 states have call predecessors, (18), 1 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) [2023-04-02 22:36:44,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:36:44,321 INFO L93 Difference]: Finished difference Result 121 states and 147 transitions. [2023-04-02 22:36:44,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-02 22:36:44,322 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (18), 3 states have call predecessors, (18), 1 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) Word has length 49 [2023-04-02 22:36:44,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:36:44,323 INFO L225 Difference]: With dead ends: 121 [2023-04-02 22:36:44,323 INFO L226 Difference]: Without dead ends: 119 [2023-04-02 22:36:44,323 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 122 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=440, Unknown=0, NotChecked=0, Total=506 [2023-04-02 22:36:44,324 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 7 mSDsluCounter, 133 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:36:44,324 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 176 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:36:44,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2023-04-02 22:36:44,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2023-04-02 22:36:44,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 62 states have (on average 1.1129032258064515) internal successors, (69), 65 states have internal predecessors, (69), 40 states have call successors, (40), 17 states have call predecessors, (40), 16 states have return successors, (36), 36 states have call predecessors, (36), 36 states have call successors, (36) [2023-04-02 22:36:44,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 145 transitions. [2023-04-02 22:36:44,357 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 145 transitions. Word has length 49 [2023-04-02 22:36:44,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:36:44,358 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 145 transitions. [2023-04-02 22:36:44,358 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.1) internal successors, (21), 8 states have internal predecessors, (21), 5 states have call successors, (18), 3 states have call predecessors, (18), 1 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) [2023-04-02 22:36:44,358 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 145 transitions. [2023-04-02 22:36:44,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-04-02 22:36:44,358 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:36:44,358 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:36:44,366 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 22:36:44,559 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:44,559 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:36:44,559 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:36:44,560 INFO L85 PathProgramCache]: Analyzing trace with hash 1692777595, now seen corresponding path program 3 times [2023-04-02 22:36:44,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:36:44,560 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1800126283] [2023-04-02 22:36:44,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:44,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:36:44,566 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:36:44,566 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1691147207] [2023-04-02 22:36:44,566 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:36:44,566 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:44,566 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:36:44,567 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 22:36:44,569 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 22:36:44,611 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:36:44,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:36:44,612 INFO L262 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 26 conjunts are in the unsatisfiable core [2023-04-02 22:36:44,613 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:36:44,712 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 15 proven. 28 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2023-04-02 22:36:44,712 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:36:45,190 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:36:45,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1800126283] [2023-04-02 22:36:45,190 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:36:45,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1691147207] [2023-04-02 22:36:45,190 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1691147207] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:36:45,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [727065791] [2023-04-02 22:36:45,192 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 22:36:45,192 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:36:45,192 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:36:45,192 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:36:45,192 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:36:45,205 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:36:45,919 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-04-02 22:36:45,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:36:45,924 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:36:46,223 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2814#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:36:46,223 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:36:46,223 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:36:46,223 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2023-04-02 22:36:46,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592332393] [2023-04-02 22:36:46,223 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 22:36:46,223 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-04-02 22:36:46,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:36:46,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-04-02 22:36:46,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=396, Unknown=0, NotChecked=0, Total=462 [2023-04-02 22:36:46,224 INFO L87 Difference]: Start difference. First operand 119 states and 145 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-04-02 22:36:46,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:36:46,362 INFO L93 Difference]: Finished difference Result 125 states and 150 transitions. [2023-04-02 22:36:46,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 22:36:46,362 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 54 [2023-04-02 22:36:46,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:36:46,367 INFO L225 Difference]: With dead ends: 125 [2023-04-02 22:36:46,368 INFO L226 Difference]: Without dead ends: 121 [2023-04-02 22:36:46,368 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 106 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2023-04-02 22:36:46,369 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 13 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:36:46,369 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 79 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:36:46,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2023-04-02 22:36:46,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2023-04-02 22:36:46,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 65 states have (on average 1.1076923076923078) internal successors, (72), 68 states have internal predecessors, (72), 38 states have call successors, (38), 18 states have call predecessors, (38), 17 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2023-04-02 22:36:46,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 144 transitions. [2023-04-02 22:36:46,384 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 144 transitions. Word has length 54 [2023-04-02 22:36:46,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:36:46,384 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 144 transitions. [2023-04-02 22:36:46,384 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-04-02 22:36:46,384 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 144 transitions. [2023-04-02 22:36:46,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2023-04-02 22:36:46,385 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:36:46,385 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:36:46,398 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-04-02 22:36:46,589 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:46,590 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:36:46,590 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:36:46,590 INFO L85 PathProgramCache]: Analyzing trace with hash -1446194315, now seen corresponding path program 1 times [2023-04-02 22:36:46,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:36:46,590 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137628149] [2023-04-02 22:36:46,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:46,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:36:46,596 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:36:46,596 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [868321546] [2023-04-02 22:36:46,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:46,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:46,596 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:36:46,613 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 22:36:46,614 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 22:36:46,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:36:46,657 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 26 conjunts are in the unsatisfiable core [2023-04-02 22:36:46,658 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:36:46,781 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 21 proven. 39 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2023-04-02 22:36:46,782 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:36:46,932 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:36:46,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137628149] [2023-04-02 22:36:46,932 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:36:46,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [868321546] [2023-04-02 22:36:46,933 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [868321546] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:36:46,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [989469272] [2023-04-02 22:36:46,934 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 22:36:46,934 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:36:46,934 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:36:46,934 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:36:46,934 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:36:46,947 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:36:47,719 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2023-04-02 22:36:47,723 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:36:47,726 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:36:48,235 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3536#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:36:48,236 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:36:48,236 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:36:48,236 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2023-04-02 22:36:48,236 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1008487784] [2023-04-02 22:36:48,236 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 22:36:48,236 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-02 22:36:48,236 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:36:48,237 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-02 22:36:48,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=573, Unknown=0, NotChecked=0, Total=650 [2023-04-02 22:36:48,237 INFO L87 Difference]: Start difference. First operand 121 states and 144 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-04-02 22:36:48,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:36:48,450 INFO L93 Difference]: Finished difference Result 127 states and 149 transitions. [2023-04-02 22:36:48,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-02 22:36:48,451 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 70 [2023-04-02 22:36:48,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:36:48,452 INFO L225 Difference]: With dead ends: 127 [2023-04-02 22:36:48,452 INFO L226 Difference]: Without dead ends: 125 [2023-04-02 22:36:48,452 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 149 SyntacticMatches, 5 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2023-04-02 22:36:48,453 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 13 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 231 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 231 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:36:48,453 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 86 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 231 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:36:48,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2023-04-02 22:36:48,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2023-04-02 22:36:48,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 68 states have (on average 1.1029411764705883) internal successors, (75), 71 states have internal predecessors, (75), 38 states have call successors, (38), 19 states have call predecessors, (38), 18 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2023-04-02 22:36:48,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 147 transitions. [2023-04-02 22:36:48,484 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 147 transitions. Word has length 70 [2023-04-02 22:36:48,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:36:48,485 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 147 transitions. [2023-04-02 22:36:48,485 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) [2023-04-02 22:36:48,485 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 147 transitions. [2023-04-02 22:36:48,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-04-02 22:36:48,486 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:36:48,486 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:36:48,495 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-04-02 22:36:48,698 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:48,698 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:36:48,698 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:36:48,698 INFO L85 PathProgramCache]: Analyzing trace with hash -2131269829, now seen corresponding path program 1 times [2023-04-02 22:36:48,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:36:48,699 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959299905] [2023-04-02 22:36:48,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:48,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:36:48,710 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:36:48,711 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1676095290] [2023-04-02 22:36:48,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:48,711 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:48,711 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:36:48,721 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 22:36:48,729 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 22:36:48,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:36:48,768 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-02 22:36:48,770 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:36:48,896 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 23 proven. 42 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2023-04-02 22:36:48,896 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:36:49,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:36:49,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959299905] [2023-04-02 22:36:49,047 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:36:49,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676095290] [2023-04-02 22:36:49,048 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1676095290] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:36:49,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [157453949] [2023-04-02 22:36:49,049 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 22:36:49,049 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:36:49,049 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:36:49,049 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:36:49,049 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:36:49,061 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:36:49,828 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 9 for LOIs [2023-04-02 22:36:49,831 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:36:49,833 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:36:50,282 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4298#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:36:50,283 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:36:50,283 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:36:50,283 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2023-04-02 22:36:50,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856855742] [2023-04-02 22:36:50,283 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 22:36:50,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-04-02 22:36:50,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:36:50,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-04-02 22:36:50,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=522, Unknown=0, NotChecked=0, Total=600 [2023-04-02 22:36:50,284 INFO L87 Difference]: Start difference. First operand 125 states and 147 transitions. Second operand has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2023-04-02 22:36:50,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:36:50,432 INFO L93 Difference]: Finished difference Result 135 states and 155 transitions. [2023-04-02 22:36:50,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-02 22:36:50,434 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) Word has length 75 [2023-04-02 22:36:50,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:36:50,435 INFO L225 Difference]: With dead ends: 135 [2023-04-02 22:36:50,435 INFO L226 Difference]: Without dead ends: 131 [2023-04-02 22:36:50,435 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 164 SyntacticMatches, 6 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=98, Invalid=658, Unknown=0, NotChecked=0, Total=756 [2023-04-02 22:36:50,435 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 13 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 22:36:50,436 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 86 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 233 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 22:36:50,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2023-04-02 22:36:50,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131. [2023-04-02 22:36:50,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 73 states have (on average 1.082191780821918) internal successors, (79), 75 states have internal predecessors, (79), 38 states have call successors, (38), 21 states have call predecessors, (38), 19 states have return successors, (34), 34 states have call predecessors, (34), 34 states have call successors, (34) [2023-04-02 22:36:50,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 151 transitions. [2023-04-02 22:36:50,458 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 151 transitions. Word has length 75 [2023-04-02 22:36:50,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:36:50,458 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 151 transitions. [2023-04-02 22:36:50,458 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 2.125) internal successors, (17), 8 states have internal predecessors, (17), 4 states have call successors, (15), 2 states have call predecessors, (15), 2 states have return successors, (13), 4 states have call predecessors, (13), 4 states have call successors, (13) [2023-04-02 22:36:50,458 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 151 transitions. [2023-04-02 22:36:50,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-04-02 22:36:50,463 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:36:50,463 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:36:50,470 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 22:36:50,668 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:50,668 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:36:50,668 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:36:50,669 INFO L85 PathProgramCache]: Analyzing trace with hash -794288980, now seen corresponding path program 4 times [2023-04-02 22:36:50,669 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:36:50,669 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [718969445] [2023-04-02 22:36:50,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:50,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:36:50,679 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:36:50,679 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [503643169] [2023-04-02 22:36:50,679 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 22:36:50,679 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:50,679 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:36:50,680 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 22:36:50,682 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 22:36:50,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:36:50,724 INFO L262 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 36 conjunts are in the unsatisfiable core [2023-04-02 22:36:50,726 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:36:50,845 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2023-04-02 22:36:50,845 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:36:51,050 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2023-04-02 22:36:51,050 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:36:51,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [718969445] [2023-04-02 22:36:51,050 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:36:51,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503643169] [2023-04-02 22:36:51,050 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503643169] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:36:51,050 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1983830373] [2023-04-02 22:36:51,051 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 22:36:51,051 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:36:51,051 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:36:51,051 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:36:51,052 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:36:51,069 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:36:51,647 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 22:36:51,652 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:36:51,654 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:36:52,180 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5186#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:36:52,180 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:36:52,180 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:36:52,180 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2023-04-02 22:36:52,181 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465063206] [2023-04-02 22:36:52,181 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:36:52,182 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-04-02 22:36:52,182 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:36:52,184 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-04-02 22:36:52,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2023-04-02 22:36:52,184 INFO L87 Difference]: Start difference. First operand 131 states and 151 transitions. Second operand has 17 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 13 states have internal predecessors, (32), 10 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (25), 9 states have call predecessors, (25), 8 states have call successors, (25) [2023-04-02 22:36:53,905 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:36:54,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:36:54,028 INFO L93 Difference]: Finished difference Result 147 states and 171 transitions. [2023-04-02 22:36:54,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-02 22:36:54,028 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 13 states have internal predecessors, (32), 10 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (25), 9 states have call predecessors, (25), 8 states have call successors, (25) Word has length 77 [2023-04-02 22:36:54,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:36:54,029 INFO L225 Difference]: With dead ends: 147 [2023-04-02 22:36:54,029 INFO L226 Difference]: Without dead ends: 131 [2023-04-02 22:36:54,030 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 197 SyntacticMatches, 6 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=153, Invalid=1037, Unknown=0, NotChecked=0, Total=1190 [2023-04-02 22:36:54,030 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 28 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 537 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 612 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 537 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-04-02 22:36:54,030 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 149 Invalid, 612 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 537 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-04-02 22:36:54,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2023-04-02 22:36:54,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 125. [2023-04-02 22:36:54,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 71 states have (on average 1.0704225352112675) internal successors, (76), 73 states have internal predecessors, (76), 34 states have call successors, (34), 20 states have call predecessors, (34), 19 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2023-04-02 22:36:54,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 141 transitions. [2023-04-02 22:36:54,050 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 141 transitions. Word has length 77 [2023-04-02 22:36:54,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:36:54,051 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 141 transitions. [2023-04-02 22:36:54,051 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 13 states have internal predecessors, (32), 10 states have call successors, (28), 3 states have call predecessors, (28), 2 states have return successors, (25), 9 states have call predecessors, (25), 8 states have call successors, (25) [2023-04-02 22:36:54,051 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 141 transitions. [2023-04-02 22:36:54,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2023-04-02 22:36:54,051 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:36:54,051 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:36:54,064 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 22:36:54,252 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,SelfDestructingSolverStorable10 [2023-04-02 22:36:54,252 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:36:54,252 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:36:54,253 INFO L85 PathProgramCache]: Analyzing trace with hash 1512565092, now seen corresponding path program 5 times [2023-04-02 22:36:54,253 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:36:54,253 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [194547835] [2023-04-02 22:36:54,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:36:54,253 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:36:54,258 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:36:54,258 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [209098658] [2023-04-02 22:36:54,258 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:36:54,258 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:36:54,258 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:36:54,266 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 22:36:54,268 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 22:36:54,346 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 22:36:54,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:36:54,347 INFO L262 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 38 conjunts are in the unsatisfiable core [2023-04-02 22:36:54,355 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:36:54,573 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 55 proven. 27 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2023-04-02 22:36:54,573 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:36:55,002 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 55 proven. 27 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2023-04-02 22:36:55,002 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:36:55,002 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [194547835] [2023-04-02 22:36:55,002 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:36:55,002 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209098658] [2023-04-02 22:36:55,003 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209098658] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:36:55,003 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1320271540] [2023-04-02 22:36:55,004 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-04-02 22:36:55,004 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:36:55,004 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:36:55,004 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:36:55,004 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:36:55,017 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:36:55,732 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 22:36:55,737 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:36:55,739 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:36:56,401 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6118#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:36:56,401 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:36:56,402 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:36:56,402 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 16 [2023-04-02 22:36:56,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965503499] [2023-04-02 22:36:56,402 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:36:56,402 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-02 22:36:56,402 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:36:56,403 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-02 22:36:56,403 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=661, Unknown=0, NotChecked=0, Total=756 [2023-04-02 22:36:56,403 INFO L87 Difference]: Start difference. First operand 125 states and 141 transitions. Second operand has 16 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (27), 7 states have call predecessors, (27), 9 states have call successors, (27) [2023-04-02 22:37:00,074 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:37:00,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:37:00,358 INFO L93 Difference]: Finished difference Result 137 states and 154 transitions. [2023-04-02 22:37:00,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-04-02 22:37:00,358 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (27), 7 states have call predecessors, (27), 9 states have call successors, (27) Word has length 82 [2023-04-02 22:37:00,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:37:00,360 INFO L225 Difference]: With dead ends: 137 [2023-04-02 22:37:00,360 INFO L226 Difference]: Without dead ends: 130 [2023-04-02 22:37:00,360 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 214 SyntacticMatches, 6 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=132, Invalid=860, Unknown=0, NotChecked=0, Total=992 [2023-04-02 22:37:00,361 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 26 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 339 mSolverCounterSat, 78 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 418 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 339 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2023-04-02 22:37:00,361 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [36 Valid, 115 Invalid, 418 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 339 Invalid, 1 Unknown, 0 Unchecked, 3.3s Time] [2023-04-02 22:37:00,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2023-04-02 22:37:00,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 128. [2023-04-02 22:37:00,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 77 states have (on average 1.0649350649350648) internal successors, (82), 79 states have internal predecessors, (82), 29 states have call successors, (29), 22 states have call predecessors, (29), 21 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2023-04-02 22:37:00,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2023-04-02 22:37:00,379 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 82 [2023-04-02 22:37:00,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:37:00,380 INFO L495 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2023-04-02 22:37:00,380 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 9 states have call successors, (30), 3 states have call predecessors, (30), 2 states have return successors, (27), 7 states have call predecessors, (27), 9 states have call successors, (27) [2023-04-02 22:37:00,380 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2023-04-02 22:37:00,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2023-04-02 22:37:00,381 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:37:00,381 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:37:00,387 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 22:37:00,585 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:37:00,586 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:37:00,586 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:37:00,586 INFO L85 PathProgramCache]: Analyzing trace with hash 2010254942, now seen corresponding path program 2 times [2023-04-02 22:37:00,586 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:37:00,586 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075746752] [2023-04-02 22:37:00,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:37:00,586 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:37:00,592 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:37:00,592 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [5224455] [2023-04-02 22:37:00,592 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:37:00,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:37:00,592 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:37:00,613 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 22:37:00,613 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 22:37:00,659 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 22:37:00,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:37:00,660 INFO L262 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 39 conjunts are in the unsatisfiable core [2023-04-02 22:37:00,662 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:37:00,878 INFO L134 CoverageAnalysis]: Checked inductivity of 536 backedges. 76 proven. 25 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2023-04-02 22:37:00,878 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:37:02,181 INFO L134 CoverageAnalysis]: Checked inductivity of 536 backedges. 92 proven. 1 refuted. 0 times theorem prover too weak. 443 trivial. 0 not checked. [2023-04-02 22:37:02,181 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:37:02,182 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075746752] [2023-04-02 22:37:02,182 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:37:02,182 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [5224455] [2023-04-02 22:37:02,182 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [5224455] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:37:02,182 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [581997789] [2023-04-02 22:37:02,183 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 22:37:02,183 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:37:02,183 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:37:02,183 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:37:02,183 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:37:02,194 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:37:02,891 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2023-04-02 22:37:02,894 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:37:02,896 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:37:03,900 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7124#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:37:03,900 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:37:03,900 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:37:03,900 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 16 [2023-04-02 22:37:03,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922397475] [2023-04-02 22:37:03,900 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:37:03,901 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-04-02 22:37:03,901 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:37:03,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-04-02 22:37:03,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=715, Unknown=0, NotChecked=0, Total=812 [2023-04-02 22:37:03,901 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand has 16 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 13 states have internal predecessors, (32), 9 states have call successors, (31), 3 states have call predecessors, (31), 2 states have return successors, (28), 7 states have call predecessors, (28), 7 states have call successors, (28) [2023-04-02 22:37:05,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:37:05,442 INFO L93 Difference]: Finished difference Result 140 states and 150 transitions. [2023-04-02 22:37:05,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-04-02 22:37:05,443 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 13 states have internal predecessors, (32), 9 states have call successors, (31), 3 states have call predecessors, (31), 2 states have return successors, (28), 7 states have call predecessors, (28), 7 states have call successors, (28) Word has length 98 [2023-04-02 22:37:05,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:37:05,444 INFO L225 Difference]: With dead ends: 140 [2023-04-02 22:37:05,444 INFO L226 Difference]: Without dead ends: 136 [2023-04-02 22:37:05,444 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 259 SyntacticMatches, 7 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 317 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=117, Invalid=875, Unknown=0, NotChecked=0, Total=992 [2023-04-02 22:37:05,445 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 15 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2023-04-02 22:37:05,445 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 118 Invalid, 360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2023-04-02 22:37:05,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2023-04-02 22:37:05,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2023-04-02 22:37:05,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 82 states have (on average 1.048780487804878) internal successors, (86), 84 states have internal predecessors, (86), 31 states have call successors, (31), 24 states have call predecessors, (31), 22 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2023-04-02 22:37:05,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 145 transitions. [2023-04-02 22:37:05,479 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 145 transitions. Word has length 98 [2023-04-02 22:37:05,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:37:05,479 INFO L495 AbstractCegarLoop]: Abstraction has 136 states and 145 transitions. [2023-04-02 22:37:05,480 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 13 states have internal predecessors, (32), 9 states have call successors, (31), 3 states have call predecessors, (31), 2 states have return successors, (28), 7 states have call predecessors, (28), 7 states have call successors, (28) [2023-04-02 22:37:05,480 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 145 transitions. [2023-04-02 22:37:05,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-04-02 22:37:05,481 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:37:05,481 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:37:05,488 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 22:37:05,686 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,SelfDestructingSolverStorable12 [2023-04-02 22:37:05,686 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:37:05,687 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:37:05,687 INFO L85 PathProgramCache]: Analyzing trace with hash 884970994, now seen corresponding path program 2 times [2023-04-02 22:37:05,687 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:37:05,687 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508697936] [2023-04-02 22:37:05,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:37:05,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:37:05,701 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:37:05,701 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [134619448] [2023-04-02 22:37:05,701 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:37:05,701 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:37:05,701 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:37:05,702 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 22:37:05,704 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 22:37:05,748 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 22:37:05,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:37:05,749 INFO L262 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 41 conjunts are in the unsatisfiable core [2023-04-02 22:37:05,753 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:37:05,975 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 107 proven. 41 refuted. 0 times theorem prover too weak. 454 trivial. 0 not checked. [2023-04-02 22:37:05,975 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:37:06,641 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:37:06,641 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508697936] [2023-04-02 22:37:06,641 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:37:06,641 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134619448] [2023-04-02 22:37:06,642 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [134619448] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:37:06,642 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1939403270] [2023-04-02 22:37:06,648 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 22:37:06,648 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:37:06,649 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:37:06,649 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:37:06,649 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:37:06,660 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:37:07,343 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2023-04-02 22:37:07,347 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:37:07,349 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:37:07,837 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7994#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:37:07,837 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:37:07,837 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:37:07,837 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2023-04-02 22:37:07,837 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73022165] [2023-04-02 22:37:07,838 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 22:37:07,838 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-02 22:37:07,838 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:37:07,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-02 22:37:07,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=766, Unknown=0, NotChecked=0, Total=870 [2023-04-02 22:37:07,839 INFO L87 Difference]: Start difference. First operand 136 states and 145 transitions. Second operand has 11 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 6 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 5 states have call predecessors, (18), 5 states have call successors, (18) [2023-04-02 22:37:08,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:37:08,086 INFO L93 Difference]: Finished difference Result 138 states and 146 transitions. [2023-04-02 22:37:08,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-04-02 22:37:08,087 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 6 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 5 states have call predecessors, (18), 5 states have call successors, (18) Word has length 103 [2023-04-02 22:37:08,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:37:08,088 INFO L225 Difference]: With dead ends: 138 [2023-04-02 22:37:08,088 INFO L226 Difference]: Without dead ends: 127 [2023-04-02 22:37:08,088 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 213 SyntacticMatches, 8 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 327 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=129, Invalid=927, Unknown=0, NotChecked=0, Total=1056 [2023-04-02 22:37:08,089 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 13 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:37:08,089 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 112 Invalid, 352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:37:08,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2023-04-02 22:37:08,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2023-04-02 22:37:08,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 77 states have (on average 1.0389610389610389) internal successors, (80), 79 states have internal predecessors, (80), 28 states have call successors, (28), 22 states have call predecessors, (28), 21 states have return successors, (26), 25 states have call predecessors, (26), 26 states have call successors, (26) [2023-04-02 22:37:08,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 134 transitions. [2023-04-02 22:37:08,110 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 134 transitions. Word has length 103 [2023-04-02 22:37:08,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:37:08,110 INFO L495 AbstractCegarLoop]: Abstraction has 127 states and 134 transitions. [2023-04-02 22:37:08,110 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.0) internal successors, (20), 9 states have internal predecessors, (20), 6 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (18), 5 states have call predecessors, (18), 5 states have call successors, (18) [2023-04-02 22:37:08,110 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 134 transitions. [2023-04-02 22:37:08,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2023-04-02 22:37:08,114 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:37:08,114 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:37:08,118 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 22:37:08,318 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,SelfDestructingSolverStorable13 [2023-04-02 22:37:08,319 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:37:08,319 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:37:08,319 INFO L85 PathProgramCache]: Analyzing trace with hash -689366782, now seen corresponding path program 2 times [2023-04-02 22:37:08,319 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:37:08,319 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599845267] [2023-04-02 22:37:08,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:37:08,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:37:08,325 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:37:08,325 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1309751531] [2023-04-02 22:37:08,325 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:37:08,325 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:37:08,325 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:37:08,328 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 22:37:08,329 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 22:37:08,455 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2023-04-02 22:37:08,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:37:08,456 INFO L262 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 13 conjunts are in the unsatisfiable core [2023-04-02 22:37:08,458 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:37:08,575 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 120 proven. 656 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2023-04-02 22:37:08,575 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:37:08,685 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 42 proven. 56 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2023-04-02 22:37:08,685 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:37:08,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599845267] [2023-04-02 22:37:08,685 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:37:08,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1309751531] [2023-04-02 22:37:08,685 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1309751531] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:37:08,685 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1672767138] [2023-04-02 22:37:08,686 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-04-02 22:37:08,686 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:37:08,686 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:37:08,686 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:37:08,686 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:37:08,710 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:37:09,288 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2023-04-02 22:37:09,293 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:37:09,295 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:37:09,687 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9172#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:37:09,687 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:37:09,687 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:37:09,687 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2023-04-02 22:37:09,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35175242] [2023-04-02 22:37:09,687 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:37:09,688 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-04-02 22:37:09,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:37:09,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-04-02 22:37:09,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2023-04-02 22:37:09,689 INFO L87 Difference]: Start difference. First operand 127 states and 134 transitions. Second operand has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 12 states have call successors, (46), 8 states have call predecessors, (46), 8 states have return successors, (44), 11 states have call predecessors, (44), 10 states have call successors, (44) [2023-04-02 22:37:10,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:37:10,007 INFO L93 Difference]: Finished difference Result 369 states and 401 transitions. [2023-04-02 22:37:10,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-04-02 22:37:10,008 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 12 states have call successors, (46), 8 states have call predecessors, (46), 8 states have return successors, (44), 11 states have call predecessors, (44), 10 states have call successors, (44) Word has length 128 [2023-04-02 22:37:10,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:37:10,009 INFO L225 Difference]: With dead ends: 369 [2023-04-02 22:37:10,009 INFO L226 Difference]: Without dead ends: 355 [2023-04-02 22:37:10,011 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 350 SyntacticMatches, 8 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 522 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=250, Invalid=1010, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 22:37:10,012 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 152 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 22:37:10,012 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [152 Valid, 140 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 22:37:10,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 355 states. [2023-04-02 22:37:10,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 355 to 288. [2023-04-02 22:37:10,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 288 states, 173 states have (on average 1.0578034682080926) internal successors, (183), 181 states have internal predecessors, (183), 67 states have call successors, (67), 48 states have call predecessors, (67), 47 states have return successors, (64), 58 states have call predecessors, (64), 64 states have call successors, (64) [2023-04-02 22:37:10,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 314 transitions. [2023-04-02 22:37:10,074 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 314 transitions. Word has length 128 [2023-04-02 22:37:10,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:37:10,074 INFO L495 AbstractCegarLoop]: Abstraction has 288 states and 314 transitions. [2023-04-02 22:37:10,074 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 12 states have call successors, (46), 8 states have call predecessors, (46), 8 states have return successors, (44), 11 states have call predecessors, (44), 10 states have call successors, (44) [2023-04-02 22:37:10,075 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 314 transitions. [2023-04-02 22:37:10,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2023-04-02 22:37:10,075 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:37:10,075 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 22, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:37:10,081 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 22:37:10,280 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,SelfDestructingSolverStorable14 [2023-04-02 22:37:10,280 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:37:10,281 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:37:10,281 INFO L85 PathProgramCache]: Analyzing trace with hash -810345431, now seen corresponding path program 3 times [2023-04-02 22:37:10,281 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:37:10,281 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413651282] [2023-04-02 22:37:10,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:37:10,281 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:37:10,288 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:37:10,288 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1511243506] [2023-04-02 22:37:10,288 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 22:37:10,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:37:10,288 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:37:10,289 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 22:37:10,291 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 22:37:13,158 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 22:37:13,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:37:13,160 INFO L262 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 51 conjunts are in the unsatisfiable core [2023-04-02 22:37:13,162 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:37:13,405 INFO L134 CoverageAnalysis]: Checked inductivity of 1016 backedges. 143 proven. 188 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2023-04-02 22:37:13,406 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:37:13,601 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:37:13,601 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413651282] [2023-04-02 22:37:13,602 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:37:13,602 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1511243506] [2023-04-02 22:37:13,602 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1511243506] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 22:37:13,602 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [123664379] [2023-04-02 22:37:13,603 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-04-02 22:37:13,603 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:37:13,603 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:37:13,603 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:37:13,603 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:37:13,614 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:37:14,691 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2023-04-02 22:37:14,694 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:37:14,696 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:37:15,617 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10681#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:37:15,617 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:37:15,617 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-04-02 22:37:15,617 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2023-04-02 22:37:15,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527562562] [2023-04-02 22:37:15,617 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-04-02 22:37:15,617 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-04-02 22:37:15,617 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:37:15,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-04-02 22:37:15,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=716, Unknown=0, NotChecked=0, Total=812 [2023-04-02 22:37:15,618 INFO L87 Difference]: Start difference. First operand 288 states and 314 transitions. Second operand has 10 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) [2023-04-02 22:37:16,986 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result VALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:37:19,476 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.67s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:37:19,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:37:19,565 INFO L93 Difference]: Finished difference Result 300 states and 326 transitions. [2023-04-02 22:37:19,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-04-02 22:37:19,566 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) Word has length 131 [2023-04-02 22:37:19,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:37:19,569 INFO L225 Difference]: With dead ends: 300 [2023-04-02 22:37:19,569 INFO L226 Difference]: Without dead ends: 296 [2023-04-02 22:37:19,569 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 266 SyntacticMatches, 12 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 404 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=122, Invalid=870, Unknown=0, NotChecked=0, Total=992 [2023-04-02 22:37:19,570 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 15 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2023-04-02 22:37:19,570 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 83 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2023-04-02 22:37:19,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2023-04-02 22:37:19,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 295. [2023-04-02 22:37:19,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 178 states have (on average 1.050561797752809) internal successors, (187), 185 states have internal predecessors, (187), 68 states have call successors, (68), 50 states have call predecessors, (68), 48 states have return successors, (65), 59 states have call predecessors, (65), 65 states have call successors, (65) [2023-04-02 22:37:19,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 320 transitions. [2023-04-02 22:37:19,633 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 320 transitions. Word has length 131 [2023-04-02 22:37:19,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:37:19,633 INFO L495 AbstractCegarLoop]: Abstraction has 295 states and 320 transitions. [2023-04-02 22:37:19,633 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 8 states have (on average 2.5) internal successors, (20), 8 states have internal predecessors, (20), 5 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 5 states have call predecessors, (15), 5 states have call successors, (15) [2023-04-02 22:37:19,633 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 320 transitions. [2023-04-02 22:37:19,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2023-04-02 22:37:19,635 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:37:19,635 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:37:19,657 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 22:37:19,841 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,SelfDestructingSolverStorable15 [2023-04-02 22:37:19,841 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:37:19,842 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:37:19,842 INFO L85 PathProgramCache]: Analyzing trace with hash 721651399, now seen corresponding path program 1 times [2023-04-02 22:37:19,842 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:37:19,842 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795297830] [2023-04-02 22:37:19,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:37:19,842 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:37:19,851 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:37:19,851 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1218176034] [2023-04-02 22:37:19,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:37:19,851 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:37:19,851 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:37:19,852 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 22:37:19,854 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 22:37:19,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 22:37:19,913 INFO L262 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 49 conjunts are in the unsatisfiable core [2023-04-02 22:37:19,915 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:37:20,416 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 104 proven. 116 refuted. 0 times theorem prover too weak. 886 trivial. 0 not checked. [2023-04-02 22:37:20,416 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:37:37,222 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 104 proven. 116 refuted. 0 times theorem prover too weak. 886 trivial. 0 not checked. [2023-04-02 22:37:37,223 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 22:37:37,223 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795297830] [2023-04-02 22:37:37,223 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2023-04-02 22:37:37,223 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1218176034] [2023-04-02 22:37:37,223 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1218176034] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 22:37:37,223 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1501157581] [2023-04-02 22:37:37,224 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-04-02 22:37:37,224 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 22:37:37,224 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 22:37:37,224 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 22:37:37,224 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 22:37:37,235 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 13 for LOIs [2023-04-02 22:37:37,994 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 14 for LOIs [2023-04-02 22:37:37,998 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-02 22:37:38,000 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 22:37:42,384 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12386#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~counter~0) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 22:37:42,384 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 22:37:42,384 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-04-02 22:37:42,384 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2023-04-02 22:37:42,384 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996268524] [2023-04-02 22:37:42,384 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-04-02 22:37:42,385 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-04-02 22:37:42,385 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 22:37:42,385 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-04-02 22:37:42,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=864, Unknown=3, NotChecked=0, Total=992 [2023-04-02 22:37:42,386 INFO L87 Difference]: Start difference. First operand 295 states and 320 transitions. Second operand has 19 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 15 states have internal predecessors, (40), 12 states have call successors, (50), 3 states have call predecessors, (50), 2 states have return successors, (47), 11 states have call predecessors, (47), 12 states have call successors, (47) [2023-04-02 22:38:08,982 WARN L223 SmtUtils]: Spent 23.02s on a formula simplification that was a NOOP. DAG size: 98 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 22:38:13,729 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 3.85s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:38:20,205 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.18s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:38:22,262 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:38:28,714 WARN L223 SmtUtils]: Spent 5.30s on a formula simplification that was a NOOP. DAG size: 103 (called from [L 376] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-04-02 22:38:30,465 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.54s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:38:33,287 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers [] [2023-04-02 22:38:40,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 22:38:40,814 INFO L93 Difference]: Finished difference Result 311 states and 339 transitions. [2023-04-02 22:38:40,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-04-02 22:38:40,814 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 15 states have internal predecessors, (40), 12 states have call successors, (50), 3 states have call predecessors, (50), 2 states have return successors, (47), 11 states have call predecessors, (47), 12 states have call successors, (47) Word has length 136 [2023-04-02 22:38:40,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 22:38:40,816 INFO L225 Difference]: With dead ends: 311 [2023-04-02 22:38:40,816 INFO L226 Difference]: Without dead ends: 295 [2023-04-02 22:38:40,816 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 414 GetRequests, 366 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 480 ImplicationChecksByTransitivity, 56.6s TimeCoverageRelationStatistics Valid=205, Invalid=1273, Unknown=4, NotChecked=0, Total=1482 [2023-04-02 22:38:40,817 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 26 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 556 mSolverCounterSat, 77 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 636 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 556 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.3s IncrementalHoareTripleChecker+Time [2023-04-02 22:38:40,817 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 173 Invalid, 636 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 556 Invalid, 3 Unknown, 0 Unchecked, 14.3s Time] [2023-04-02 22:38:40,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2023-04-02 22:38:40,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 294. [2023-04-02 22:38:40,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 294 states, 181 states have (on average 1.022099447513812) internal successors, (185), 183 states have internal predecessors, (185), 63 states have call successors, (63), 51 states have call predecessors, (63), 49 states have return successors, (60), 59 states have call predecessors, (60), 60 states have call successors, (60) [2023-04-02 22:38:40,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 308 transitions. [2023-04-02 22:38:40,893 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 308 transitions. Word has length 136 [2023-04-02 22:38:40,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 22:38:40,893 INFO L495 AbstractCegarLoop]: Abstraction has 294 states and 308 transitions. [2023-04-02 22:38:40,894 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 2.3529411764705883) internal successors, (40), 15 states have internal predecessors, (40), 12 states have call successors, (50), 3 states have call predecessors, (50), 2 states have return successors, (47), 11 states have call predecessors, (47), 12 states have call successors, (47) [2023-04-02 22:38:40,894 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 308 transitions. [2023-04-02 22:38:40,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2023-04-02 22:38:40,896 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 22:38:40,896 INFO L195 NwaCegarLoop]: trace histogram [49, 48, 48, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 22:38:40,912 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2023-04-02 22:38:41,100 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,15 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:38:41,101 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 22:38:41,101 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 22:38:41,101 INFO L85 PathProgramCache]: Analyzing trace with hash 707939092, now seen corresponding path program 2 times [2023-04-02 22:38:41,101 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 22:38:41,101 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [694533626] [2023-04-02 22:38:41,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 22:38:41,101 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 22:38:41,110 ERROR L246 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2023-04-02 22:38:41,110 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [555050286] [2023-04-02 22:38:41,110 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 22:38:41,110 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 22:38:41,111 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 22:38:41,115 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 22:38:41,115 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 22:38:41,325 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-04-02 22:38:41,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 22:38:41,326 INFO L262 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 53 conjunts are in the unsatisfiable core [2023-04-02 22:38:41,330 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 22:39:20,540 INFO L134 CoverageAnalysis]: Checked inductivity of 4896 backedges. 903 proven. 75 refuted. 0 times theorem prover too weak. 3918 trivial. 0 not checked. [2023-04-02 22:39:20,540 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 22:39:59,984 WARN L861 $PredicateComparison]: unable to prove that (let ((.cse2 (* 2 c_main_~z~0)) (.cse3 (* c_main_~y~0 c_main_~z~0))) (let ((.cse4 (div (+ .cse2 (- 6) (* (- 12) c_main_~y~0) .cse3) 18))) (let ((.cse1 (* 6 c_main_~y~0)) (.cse0 (* c_main_~z~0 c_main_~z~0)) (.cse5 (* .cse4 c_main_~z~0))) (or (not (= (+ 6 (* 6 c_main_~n~0)) c_main_~z~0)) (not (= (+ (* 6 c_main_~z~0) (* 12 c_main_~y~0)) (+ 12 .cse0))) (not (= (* 2 c_main_~y~0) (+ (* c_main_~a~0 c_main_~z~0) 2))) (not (= 0 (mod (+ .cse1 .cse2 12 .cse3) 18))) (not (= (+ .cse1 (* 6 (* .cse4 c_main_~a~0)) (* 6 (* c_main_~y~0 c_main_~a~0)) (* .cse4 6)) (+ .cse5 .cse3))) (= (+ (* 2 .cse0) (* 2 (* c_main_~y~0 c_main_~y~0)) 8 .cse3) (+ (* .cse4 36) (* .cse5 3) (* 46 c_main_~y~0) (* 7 c_main_~z~0))) (< c_main_~a~0 c_main_~n~0))))) is different from true [2023-04-02 22:41:06,419 WARN L223 SmtUtils]: Spent 5.08s on a formula simplification that was a NOOP. DAG size: 7 (called from [L 809] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)