/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/array-lopstr16/break-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 15:18:12,113 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 15:18:12,115 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 15:18:12,158 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 15:18:12,158 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 15:18:12,160 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 15:18:12,164 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 15:18:12,166 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 15:18:12,167 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 15:18:12,172 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 15:18:12,174 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 15:18:12,175 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 15:18:12,175 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 15:18:12,178 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 15:18:12,178 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 15:18:12,179 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 15:18:12,180 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 15:18:12,181 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 15:18:12,182 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 15:18:12,187 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 15:18:12,188 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 15:18:12,189 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 15:18:12,190 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 15:18:12,191 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 15:18:12,198 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 15:18:12,199 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 15:18:12,199 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 15:18:12,200 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 15:18:12,201 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 15:18:12,201 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 15:18:12,201 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 15:18:12,202 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 15:18:12,203 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 15:18:12,204 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 15:18:12,204 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 15:18:12,204 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 15:18:12,205 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 15:18:12,205 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 15:18:12,205 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 15:18:12,206 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 15:18:12,206 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 15:18:12,208 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 15:18:12,235 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 15:18:12,235 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 15:18:12,236 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 15:18:12,236 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 15:18:12,236 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 15:18:12,237 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 15:18:12,237 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 15:18:12,237 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 15:18:12,237 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 15:18:12,237 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 15:18:12,238 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 15:18:12,238 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 15:18:12,238 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 15:18:12,238 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 15:18:12,238 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 15:18:12,238 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 15:18:12,238 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 15:18:12,238 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 15:18:12,239 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 15:18:12,239 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 15:18:12,239 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 15:18:12,239 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 15:18:12,239 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 15:18:12,240 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 15:18:12,240 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 15:18:12,240 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 15:18:12,240 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 15:18:12,240 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 15:18:12,240 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 15:18:12,240 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 15:18:12,240 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 15:18:12,241 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 15:18:12,241 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:18:12,241 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 15:18:12,241 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 15:18:12,241 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 15:18:12,241 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 15:18:12,241 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 15:18:12,241 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 15:18:12,242 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 15:18:12,242 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 15:18:12,242 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 15:18:12,449 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 15:18:12,465 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 15:18:12,467 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 15:18:12,468 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 15:18:12,469 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 15:18:12,470 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-lopstr16/break-1.i [2023-04-02 15:18:13,628 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 15:18:13,821 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 15:18:13,821 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-lopstr16/break-1.i [2023-04-02 15:18:13,827 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7f5e54488/76c15a2f37794dd4b1ea0d9d8d739dae/FLAGfadf11ed8 [2023-04-02 15:18:13,841 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7f5e54488/76c15a2f37794dd4b1ea0d9d8d739dae [2023-04-02 15:18:13,845 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 15:18:13,847 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 15:18:13,850 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 15:18:13,850 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 15:18:13,853 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 15:18:13,854 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:18:13" (1/1) ... [2023-04-02 15:18:13,855 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ac5cc5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:18:13, skipping insertion in model container [2023-04-02 15:18:13,855 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 03:18:13" (1/1) ... [2023-04-02 15:18:13,862 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 15:18:13,880 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 15:18:14,031 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-lopstr16/break-1.i[800,813] [2023-04-02 15:18:14,053 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:18:20,112 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 15:18:20,122 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-lopstr16/break-1.i[800,813] [2023-04-02 15:18:20,132 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 15:18:20,146 INFO L208 MainTranslator]: Completed translation [2023-04-02 15:18:20,147 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:18:20 WrapperNode [2023-04-02 15:18:20,147 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 15:18:20,148 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 15:18:20,148 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 15:18:20,148 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 15:18:20,159 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:18:20" (1/1) ... [2023-04-02 15:18:20,159 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:18:20" (1/1) ... [2023-04-02 15:18:20,167 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:18:20" (1/1) ... [2023-04-02 15:18:20,167 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:18:20" (1/1) ... [2023-04-02 15:18:20,180 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:18:20" (1/1) ... [2023-04-02 15:18:20,185 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:18:20" (1/1) ... [2023-04-02 15:18:20,189 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:18:20" (1/1) ... [2023-04-02 15:18:20,190 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:18:20" (1/1) ... [2023-04-02 15:18:20,192 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 15:18:20,193 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 15:18:20,193 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 15:18:20,194 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 15:18:20,195 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:18:20" (1/1) ... [2023-04-02 15:18:20,201 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 15:18:20,209 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:18:20,221 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-02 15:18:20,240 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-02 15:18:20,259 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 15:18:20,259 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 15:18:20,259 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 15:18:20,259 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 15:18:20,259 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 15:18:20,259 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 15:18:20,259 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 15:18:20,259 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-02 15:18:20,260 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-02 15:18:20,260 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 15:18:20,260 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 15:18:20,260 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 15:18:20,260 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2023-04-02 15:18:20,260 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 15:18:20,260 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 15:18:20,260 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-04-02 15:18:20,260 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-04-02 15:18:20,260 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-04-02 15:18:20,260 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 15:18:20,260 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 15:18:20,260 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 15:18:20,261 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 15:18:20,261 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 15:18:20,261 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 15:18:20,335 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 15:18:20,337 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 15:18:20,615 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 15:18:20,637 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 15:18:20,637 INFO L302 CfgBuilder]: Removed 2 assume(true) statements. [2023-04-02 15:18:20,640 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:18:20 BoogieIcfgContainer [2023-04-02 15:18:20,641 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 15:18:20,642 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 15:18:20,642 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 15:18:20,645 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 15:18:20,645 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 03:18:13" (1/3) ... [2023-04-02 15:18:20,646 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4df2b344 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:18:20, skipping insertion in model container [2023-04-02 15:18:20,646 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 03:18:20" (2/3) ... [2023-04-02 15:18:20,646 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4df2b344 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 03:18:20, skipping insertion in model container [2023-04-02 15:18:20,646 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 03:18:20" (3/3) ... [2023-04-02 15:18:20,647 INFO L112 eAbstractionObserver]: Analyzing ICFG break-1.i [2023-04-02 15:18:20,663 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 15:18:20,664 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 15:18:20,714 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 15:18:20,721 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;@440b74f2, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 15:18:20,721 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 15:18:20,725 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 15:18:20,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-04-02 15:18:20,734 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:18:20,734 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:18:20,734 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:18:20,740 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:18:20,740 INFO L85 PathProgramCache]: Analyzing trace with hash -1797247767, now seen corresponding path program 1 times [2023-04-02 15:18:20,749 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:18:20,749 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239682129] [2023-04-02 15:18:20,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:20,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:18:20,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:21,017 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:18:21,017 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:18:21,018 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239682129] [2023-04-02 15:18:21,018 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [239682129] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:18:21,019 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 15:18:21,019 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 15:18:21,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614424944] [2023-04-02 15:18:21,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:18:21,025 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 15:18:21,026 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:18:21,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 15:18:21,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 15:18:21,053 INFO L87 Difference]: Start difference. First operand has 22 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:18:21,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:18:21,111 INFO L93 Difference]: Finished difference Result 45 states and 58 transitions. [2023-04-02 15:18:21,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 15:18:21,114 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-04-02 15:18:21,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:18:21,118 INFO L225 Difference]: With dead ends: 45 [2023-04-02 15:18:21,119 INFO L226 Difference]: Without dead ends: 27 [2023-04-02 15:18:21,121 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 15:18:21,123 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 6 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:18:21,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 32 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:18:21,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-04-02 15:18:21,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 20. [2023-04-02 15:18:21,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:18:21,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2023-04-02 15:18:21,150 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 13 [2023-04-02 15:18:21,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:18:21,150 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2023-04-02 15:18:21,151 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:18:21,151 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2023-04-02 15:18:21,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-02 15:18:21,151 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:18:21,151 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:18:21,152 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 15:18:21,152 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:18:21,152 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:18:21,152 INFO L85 PathProgramCache]: Analyzing trace with hash -293571886, now seen corresponding path program 1 times [2023-04-02 15:18:21,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:18:21,153 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442669996] [2023-04-02 15:18:21,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:21,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:18:21,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:21,193 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:18:21,193 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:18:21,193 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442669996] [2023-04-02 15:18:21,193 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [442669996] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 15:18:21,194 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 15:18:21,194 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 15:18:21,194 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34315934] [2023-04-02 15:18:21,194 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 15:18:21,195 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 15:18:21,195 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:18:21,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 15:18:21,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 15:18:21,196 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:18:21,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:18:21,210 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2023-04-02 15:18:21,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 15:18:21,211 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 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 14 [2023-04-02 15:18:21,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:18:21,211 INFO L225 Difference]: With dead ends: 35 [2023-04-02 15:18:21,212 INFO L226 Difference]: Without dead ends: 20 [2023-04-02 15:18:21,212 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 15:18:21,213 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 2 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:18:21,214 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 33 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:18:21,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-04-02 15:18:21,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-04-02 15:18:21,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:18:21,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2023-04-02 15:18:21,217 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 14 [2023-04-02 15:18:21,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:18:21,217 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2023-04-02 15:18:21,218 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:18:21,218 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2023-04-02 15:18:21,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-04-02 15:18:21,218 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:18:21,218 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:18:21,218 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-02 15:18:21,219 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:18:21,219 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:18:21,219 INFO L85 PathProgramCache]: Analyzing trace with hash -195052990, now seen corresponding path program 1 times [2023-04-02 15:18:21,219 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:18:21,219 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118614120] [2023-04-02 15:18:21,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:21,220 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:18:21,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:21,326 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:18:21,327 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:18:21,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118614120] [2023-04-02 15:18:21,327 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2118614120] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:18:21,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270013914] [2023-04-02 15:18:21,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:21,328 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:21,328 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:18:21,331 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:18:21,332 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 15:18:21,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:21,405 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-02 15:18:21,411 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:18:21,456 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:18:21,456 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:18:21,496 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:18:21,496 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1270013914] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:18:21,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [22974768] [2023-04-02 15:18:21,514 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-04-02 15:18:21,515 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:18:21,517 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:18:21,521 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:18:21,522 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:18:21,647 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 29 for LOIs [2023-04-02 15:18:21,807 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:18:21,826 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 19 for LOIs [2023-04-02 15:18:21,842 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:18:22,329 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '290#(and (<= 1 |#StackHeapBarrier|) (= |~#s~0.base| 3) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= (select (select |#memory_$Pointer$.offset| 3) 0) 0) (= |~#s~0.offset| 0) (= |#NULL.offset| 0) (= (select (select |#memory_$Pointer$.base| 3) 0) 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:18:22,330 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:18:22,331 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:18:22,331 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-02 15:18:22,331 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609789411] [2023-04-02 15:18:22,331 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:18:22,333 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 15:18:22,333 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:18:22,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 15:18:22,335 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2023-04-02 15:18:22,335 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:18:22,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:18:22,400 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2023-04-02 15:18:22,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 15:18:22,400 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2023-04-02 15:18:22,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:18:22,401 INFO L225 Difference]: With dead ends: 54 [2023-04-02 15:18:22,401 INFO L226 Difference]: Without dead ends: 42 [2023-04-02 15:18:22,402 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2023-04-02 15:18:22,403 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 23 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 15:18:22,403 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 35 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 15:18:22,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-04-02 15:18:22,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 26. [2023-04-02 15:18:22,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:18:22,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2023-04-02 15:18:22,408 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 15 [2023-04-02 15:18:22,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:18:22,409 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2023-04-02 15:18:22,409 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:18:22,409 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2023-04-02 15:18:22,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-04-02 15:18:22,410 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:18:22,410 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:18:22,419 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 15:18:22,616 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:22,616 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:18:22,617 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:18:22,617 INFO L85 PathProgramCache]: Analyzing trace with hash 2029319373, now seen corresponding path program 2 times [2023-04-02 15:18:22,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:18:22,618 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1686775516] [2023-04-02 15:18:22,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:22,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:18:22,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:22,780 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:18:22,780 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:18:22,780 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1686775516] [2023-04-02 15:18:22,780 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1686775516] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:18:22,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [792937367] [2023-04-02 15:18:22,781 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:18:22,781 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:22,781 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:18:22,782 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:18:22,785 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 15:18:22,870 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-04-02 15:18:22,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:18:22,872 INFO L262 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 15:18:22,873 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:18:22,891 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:18:22,892 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:18:22,944 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:18:22,945 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [792937367] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:18:22,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [524823918] [2023-04-02 15:18:22,947 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-04-02 15:18:22,947 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:18:22,947 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:18:22,948 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:18:22,948 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:18:23,005 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 29 for LOIs [2023-04-02 15:18:23,104 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:18:23,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 19 for LOIs [2023-04-02 15:18:23,129 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:18:23,653 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '552#(and (<= 1 |#StackHeapBarrier|) (= |~#s~0.base| 3) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= (select (select |#memory_$Pointer$.offset| 3) 0) 0) (= |~#s~0.offset| 0) (= |#NULL.offset| 0) (= (select (select |#memory_$Pointer$.base| 3) 0) 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:18:23,653 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:18:23,654 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:18:23,654 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-04-02 15:18:23,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705481285] [2023-04-02 15:18:23,654 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:18:23,655 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-02 15:18:23,655 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:18:23,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-02 15:18:23,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=455, Unknown=0, NotChecked=0, Total=600 [2023-04-02 15:18:23,656 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:18:23,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:18:23,797 INFO L93 Difference]: Finished difference Result 96 states and 112 transitions. [2023-04-02 15:18:23,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-02 15:18:23,797 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 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 21 [2023-04-02 15:18:23,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:18:23,802 INFO L225 Difference]: With dead ends: 96 [2023-04-02 15:18:23,802 INFO L226 Difference]: Without dead ends: 84 [2023-04-02 15:18:23,803 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=145, Invalid=455, Unknown=0, NotChecked=0, Total=600 [2023-04-02 15:18:23,806 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 65 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 15:18:23,807 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 59 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 15:18:23,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-04-02 15:18:23,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 38. [2023-04-02 15:18:23,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 32 states have (on average 1.0625) internal successors, (34), 32 states have internal predecessors, (34), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:18:23,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2023-04-02 15:18:23,824 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 21 [2023-04-02 15:18:23,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:18:23,824 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2023-04-02 15:18:23,825 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:18:23,825 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2023-04-02 15:18:23,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-04-02 15:18:23,826 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:18:23,826 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:18:23,833 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 15:18:24,034 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-04-02 15:18:24,034 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:18:24,035 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:18:24,035 INFO L85 PathProgramCache]: Analyzing trace with hash -638870237, now seen corresponding path program 3 times [2023-04-02 15:18:24,035 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:18:24,035 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161956634] [2023-04-02 15:18:24,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:24,036 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:18:24,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:24,394 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:18:24,394 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:18:24,394 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161956634] [2023-04-02 15:18:24,394 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [161956634] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:18:24,394 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [247336870] [2023-04-02 15:18:24,395 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 15:18:24,395 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:24,395 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:18:24,396 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:18:24,425 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 15:18:24,673 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 15:18:24,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 15:18:24,677 INFO L262 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 15:18:24,679 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:18:24,716 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:18:24,717 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:18:24,902 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:18:24,903 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [247336870] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:18:24,903 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [10608475] [2023-04-02 15:18:24,907 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-04-02 15:18:24,907 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:18:24,908 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:18:24,908 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:18:24,908 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:18:24,963 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 29 for LOIs [2023-04-02 15:18:25,048 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:18:25,065 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 19 for LOIs [2023-04-02 15:18:25,077 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:18:25,513 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '976#(and (<= 1 |#StackHeapBarrier|) (= |~#s~0.base| 3) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= (select (select |#memory_$Pointer$.offset| 3) 0) 0) (= |~#s~0.offset| 0) (= |#NULL.offset| 0) (= (select (select |#memory_$Pointer$.base| 3) 0) 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:18:25,514 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:18:25,514 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:18:25,514 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2023-04-02 15:18:25,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864796806] [2023-04-02 15:18:25,514 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:18:25,515 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-02 15:18:25,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:18:25,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-02 15:18:25,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=391, Invalid=941, Unknown=0, NotChecked=0, Total=1332 [2023-04-02 15:18:25,517 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 25 states, 25 states have (on average 2.16) internal successors, (54), 25 states have internal predecessors, (54), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:18:25,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:18:25,767 INFO L93 Difference]: Finished difference Result 180 states and 214 transitions. [2023-04-02 15:18:25,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-02 15:18:25,767 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 25 states have internal predecessors, (54), 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 33 [2023-04-02 15:18:25,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:18:25,769 INFO L225 Difference]: With dead ends: 180 [2023-04-02 15:18:25,769 INFO L226 Difference]: Without dead ends: 168 [2023-04-02 15:18:25,770 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 474 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=391, Invalid=941, Unknown=0, NotChecked=0, Total=1332 [2023-04-02 15:18:25,770 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 176 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 244 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 15:18:25,771 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [198 Valid, 88 Invalid, 244 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 15:18:25,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2023-04-02 15:18:25,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 62. [2023-04-02 15:18:25,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 56 states have (on average 1.0357142857142858) internal successors, (58), 56 states have internal predecessors, (58), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:18:25,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2023-04-02 15:18:25,782 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 33 [2023-04-02 15:18:25,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:18:25,782 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2023-04-02 15:18:25,783 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.16) internal successors, (54), 25 states have internal predecessors, (54), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:18:25,783 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2023-04-02 15:18:25,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-04-02 15:18:25,784 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:18:25,784 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:18:25,795 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 15:18:25,991 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:25,991 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:18:25,992 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:18:25,992 INFO L85 PathProgramCache]: Analyzing trace with hash 266533583, now seen corresponding path program 4 times [2023-04-02 15:18:25,992 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:18:25,992 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634410019] [2023-04-02 15:18:25,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:25,993 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:18:26,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:26,685 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:18:26,686 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:18:26,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634410019] [2023-04-02 15:18:26,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [634410019] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:18:26,686 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1954584083] [2023-04-02 15:18:26,686 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 15:18:26,686 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:26,686 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:18:26,687 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:18:26,713 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 15:18:26,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:26,859 INFO L262 TraceCheckSpWp]: Trace formula consists of 662 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-02 15:18:26,862 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 15:18:26,921 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:18:26,921 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 15:18:27,607 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:18:27,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1954584083] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 15:18:27,608 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [696513971] [2023-04-02 15:18:27,609 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-04-02 15:18:27,609 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 15:18:27,610 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 15:18:27,610 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 15:18:27,610 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 15:18:27,641 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 29 for LOIs [2023-04-02 15:18:27,689 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 31 for LOIs [2023-04-02 15:18:27,697 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 19 for LOIs [2023-04-02 15:18:27,704 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 15:18:28,153 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1724#(and (<= 1 |#StackHeapBarrier|) (= |~#s~0.base| 3) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= (select (select |#memory_$Pointer$.offset| 3) 0) 0) (= |~#s~0.offset| 0) (= |#NULL.offset| 0) (= (select (select |#memory_$Pointer$.base| 3) 0) 0) (= |#NULL.base| 0))' at error location [2023-04-02 15:18:28,153 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 15:18:28,153 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 15:18:28,153 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2023-04-02 15:18:28,153 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457098255] [2023-04-02 15:18:28,154 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 15:18:28,154 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-04-02 15:18:28,154 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 15:18:28,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-04-02 15:18:28,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1315, Invalid=2345, Unknown=0, NotChecked=0, Total=3660 [2023-04-02 15:18:28,157 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 49 states have internal predecessors, (102), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:18:28,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 15:18:28,828 INFO L93 Difference]: Finished difference Result 348 states and 418 transitions. [2023-04-02 15:18:28,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-04-02 15:18:28,829 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 49 states have internal predecessors, (102), 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 57 [2023-04-02 15:18:28,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 15:18:28,831 INFO L225 Difference]: With dead ends: 348 [2023-04-02 15:18:28,831 INFO L226 Difference]: Without dead ends: 336 [2023-04-02 15:18:28,833 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 978 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1315, Invalid=2345, Unknown=0, NotChecked=0, Total=3660 [2023-04-02 15:18:28,834 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 524 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 305 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 570 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 598 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 305 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 15:18:28,834 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [570 Valid, 121 Invalid, 598 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [305 Valid, 293 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 15:18:28,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2023-04-02 15:18:28,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 110. [2023-04-02 15:18:28,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 104 states have (on average 1.0192307692307692) internal successors, (106), 104 states have internal predecessors, (106), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 15:18:28,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 111 transitions. [2023-04-02 15:18:28,850 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 111 transitions. Word has length 57 [2023-04-02 15:18:28,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 15:18:28,850 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 111 transitions. [2023-04-02 15:18:28,850 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.0816326530612246) internal successors, (102), 49 states have internal predecessors, (102), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 15:18:28,851 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 111 transitions. [2023-04-02 15:18:28,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2023-04-02 15:18:28,855 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 15:18:28,856 INFO L195 NwaCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 15:18:28,862 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 15:18:29,062 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:29,062 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 15:18:29,063 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 15:18:29,063 INFO L85 PathProgramCache]: Analyzing trace with hash 1722018343, now seen corresponding path program 5 times [2023-04-02 15:18:29,063 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 15:18:29,063 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1340334455] [2023-04-02 15:18:29,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 15:18:29,065 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 15:18:29,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 15:18:31,344 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 15:18:31,344 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 15:18:31,344 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1340334455] [2023-04-02 15:18:31,344 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1340334455] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 15:18:31,345 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [852261527] [2023-04-02 15:18:31,345 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 15:18:31,345 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 15:18:31,345 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 15:18:31,346 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 15:18:31,350 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process