./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/nla-digbench-scaling/knuth_valuebound50.i --full-output --procedureinliner.inline.calls.to.implemented.procedures NEVER --traceabstraction.positions.where.we.compute.the.hoare.annotation All --traceabstraction.encode.modifies.clause.in.ensures.clause.of.contracts true --witnessprinter.yaml.format.version 2.1 --witnessprinter.generate.graphml.witnesses false --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version fb1cb0b9 Calling Ultimate with: /root/.sdkman/candidates/java/11.0.12-open/bin/java -Dosgi.configuration.area=/storage/repos/certificate-witnesses-artifact/automizer/data/config -Xmx15G -Xms4m -jar /storage/repos/certificate-witnesses-artifact/automizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/certificate-witnesses-artifact/automizer/data -tc /storage/repos/certificate-witnesses-artifact/automizer/config/AutomizerReach.xml -i ../sv-benchmarks/c/nla-digbench-scaling/knuth_valuebound50.i -s /storage/repos/certificate-witnesses-artifact/automizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/certificate-witnesses-artifact/automizer --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash bb5ad63279572b10ccf828ab50fb4850c30a9bc769c3e514e6f9dd22eeb86526 --procedureinliner.inline.calls.to.implemented.procedures NEVER --traceabstraction.positions.where.we.compute.the.hoare.annotation All --traceabstraction.encode.modifies.clause.in.ensures.clause.of.contracts true --witnessprinter.yaml.format.version 2.1 --witnessprinter.generate.graphml.witnesses false --- Real Ultimate output --- This is Ultimate 0.2.4-tmp.dk.referee-eval-fb1cb0b-m [2024-09-25 11:13:57,784 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-09-25 11:13:57,844 INFO L114 SettingsManager]: Loading settings from /storage/repos/certificate-witnesses-artifact/automizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2024-09-25 11:13:57,849 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-09-25 11:13:57,850 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-09-25 11:13:57,875 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-09-25 11:13:57,875 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-09-25 11:13:57,876 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-09-25 11:13:57,876 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-09-25 11:13:57,879 INFO L153 SettingsManager]: * Use memory slicer=true [2024-09-25 11:13:57,879 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-09-25 11:13:57,879 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-09-25 11:13:57,880 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-09-25 11:13:57,880 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-09-25 11:13:57,880 INFO L153 SettingsManager]: * Use SBE=true [2024-09-25 11:13:57,880 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-09-25 11:13:57,881 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-09-25 11:13:57,881 INFO L153 SettingsManager]: * sizeof long=4 [2024-09-25 11:13:57,881 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-09-25 11:13:57,884 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-09-25 11:13:57,884 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-09-25 11:13:57,884 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-09-25 11:13:57,884 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-09-25 11:13:57,885 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-09-25 11:13:57,885 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-09-25 11:13:57,885 INFO L153 SettingsManager]: * sizeof long double=12 [2024-09-25 11:13:57,885 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-09-25 11:13:57,885 INFO L153 SettingsManager]: * Use constant arrays=true [2024-09-25 11:13:57,886 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-09-25 11:13:57,886 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-09-25 11:13:57,886 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-09-25 11:13:57,886 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-09-25 11:13:57,886 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-09-25 11:13:57,886 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-09-25 11:13:57,887 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-09-25 11:13:57,887 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-09-25 11:13:57,887 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2024-09-25 11:13:57,887 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-09-25 11:13:57,887 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-09-25 11:13:57,887 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-09-25 11:13:57,888 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-09-25 11:13:57,889 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-09-25 11:13:57,889 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC 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/certificate-witnesses-artifact/automizer/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.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/certificate-witnesses-artifact/automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bb5ad63279572b10ccf828ab50fb4850c30a9bc769c3e514e6f9dd22eeb86526 Applying setting for plugin de.uni_freiburg.informatik.ultimate.boogie.procedureinliner: Inline calls to implemented procedures -> NEVER Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Positions where we compute the Hoare Annotation -> All Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Encode 'modifies' clause in 'ensures' clause of contracts -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: YAML Format version -> 2.1 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Generate GraphML witnesses -> false [2024-09-25 11:13:58,149 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-09-25 11:13:58,168 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-09-25 11:13:58,170 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-09-25 11:13:58,171 INFO L270 PluginConnector]: Initializing CDTParser... [2024-09-25 11:13:58,172 INFO L274 PluginConnector]: CDTParser initialized [2024-09-25 11:13:58,172 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/certificate-witnesses-artifact/automizer/../sv-benchmarks/c/nla-digbench-scaling/knuth_valuebound50.i [2024-09-25 11:13:59,454 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-09-25 11:13:59,611 INFO L384 CDTParser]: Found 1 translation units. [2024-09-25 11:13:59,613 INFO L180 CDTParser]: Scanning /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/nla-digbench-scaling/knuth_valuebound50.i [2024-09-25 11:13:59,623 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/certificate-witnesses-artifact/automizer/data/aab20eb3f/d196ef29c9d4402491a3bdaafc561ed7/FLAG22560faab [2024-09-25 11:13:59,640 INFO L435 CDTParser]: Successfully deleted /storage/repos/certificate-witnesses-artifact/automizer/data/aab20eb3f/d196ef29c9d4402491a3bdaafc561ed7 [2024-09-25 11:13:59,642 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-09-25 11:13:59,644 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-09-25 11:13:59,645 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-09-25 11:13:59,646 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-09-25 11:13:59,656 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-09-25 11:13:59,656 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 11:13:59" (1/1) ... [2024-09-25 11:13:59,657 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@41870e6d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:13:59, skipping insertion in model container [2024-09-25 11:13:59,657 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 11:13:59" (1/1) ... [2024-09-25 11:13:59,674 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-09-25 11:13:59,798 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/nla-digbench-scaling/knuth_valuebound50.i[948,961] [2024-09-25 11:13:59,809 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator has thrown an exception: java.lang.UnsupportedOperationException: floating point operation not supported in non-bitprecise translation: sqrt at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.expressiontranslation.IntegerTranslation.constructOtherUnaryFloatOperation(IntegerTranslation.java:610) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.standardfunctions.StandardFunctionHandler.handleUnaryFloatFunction(StandardFunctionHandler.java:2721) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.standardfunctions.StandardFunctionHandler.translateStandardFunction(StandardFunctionHandler.java:253) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.CHandler.visit(CHandler.java:1586) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.PRDispatcher.dispatch(PRDispatcher.java:271) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.CHandler.visit(CHandler.java:789) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.PRDispatcher.dispatch(PRDispatcher.java:286) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.CHandler.visit(CHandler.java:1494) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.PRDispatcher.dispatch(PRDispatcher.java:224) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.CHandler.handleCompoundStatement(CHandler.java:1150) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.CHandler.visit(CHandler.java:1133) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.PRDispatcher.dispatch(PRDispatcher.java:236) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.chandler.FunctionHandler.handleFunctionDefinition(FunctionHandler.java:387) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.CHandler.visit(CHandler.java:1613) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.PRDispatcher.dispatch(PRDispatcher.java:159) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.CHandler.processTUchild(CHandler.java:3471) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.CHandler.visit(CHandler.java:2497) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.CHandler.visit(CHandler.java:639) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.PRDispatcher.dispatch(PRDispatcher.java:135) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.MainTranslator.translate(MainTranslator.java:189) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.MainTranslator.run(MainTranslator.java:116) at de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.MainTranslator.(MainTranslator.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.CACSL2BoogieTranslatorObserver.finish(CACSL2BoogieTranslatorObserver.java:145) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2024-09-25 11:13:59,814 INFO L158 Benchmark]: Toolchain (without parser) took 169.99ms. Allocated memory is still 67.1MB. Free memory was 33.7MB in the beginning and 39.7MB in the end (delta: -6.1MB). Peak memory consumption was 3.0MB. Max. memory is 16.1GB. [2024-09-25 11:13:59,815 INFO L158 Benchmark]: CDTParser took 0.13ms. Allocated memory is still 52.4MB. Free memory is still 35.5MB. There was no memory consumed. Max. memory is 16.1GB. [2024-09-25 11:13:59,815 INFO L158 Benchmark]: CACSL2BoogieTranslator took 167.85ms. Allocated memory is still 67.1MB. Free memory was 33.5MB in the beginning and 39.7MB in the end (delta: -6.2MB). Peak memory consumption was 3.0MB. Max. memory is 16.1GB. [2024-09-25 11:13:59,816 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.13ms. Allocated memory is still 52.4MB. Free memory is still 35.5MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 167.85ms. Allocated memory is still 67.1MB. Free memory was 33.5MB in the beginning and 39.7MB in the end (delta: -6.2MB). Peak memory consumption was 3.0MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - ExceptionOrErrorResult: UnsupportedOperationException: floating point operation not supported in non-bitprecise translation: sqrt de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: UnsupportedOperationException: floating point operation not supported in non-bitprecise translation: sqrt: de.uni_freiburg.informatik.ultimate.cdt.translation.implementation.base.expressiontranslation.IntegerTranslation.constructOtherUnaryFloatOperation(IntegerTranslation.java:610) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /root/.sdkman/candidates/java/11.0.12-open/bin/java -Dosgi.configuration.area=/storage/repos/certificate-witnesses-artifact/automizer/data/config -Xmx15G -Xms4m -jar /storage/repos/certificate-witnesses-artifact/automizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/certificate-witnesses-artifact/automizer/data -tc /storage/repos/certificate-witnesses-artifact/automizer/config/AutomizerReach.xml -i ../sv-benchmarks/c/nla-digbench-scaling/knuth_valuebound50.i -s /storage/repos/certificate-witnesses-artifact/automizer/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/certificate-witnesses-artifact/automizer --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash bb5ad63279572b10ccf828ab50fb4850c30a9bc769c3e514e6f9dd22eeb86526 --procedureinliner.inline.calls.to.implemented.procedures NEVER --traceabstraction.positions.where.we.compute.the.hoare.annotation All --traceabstraction.encode.modifies.clause.in.ensures.clause.of.contracts true --witnessprinter.yaml.format.version 2.1 --witnessprinter.generate.graphml.witnesses false --- Real Ultimate output --- This is Ultimate 0.2.4-tmp.dk.referee-eval-fb1cb0b-m [2024-09-25 11:14:01,261 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-09-25 11:14:01,316 INFO L114 SettingsManager]: Loading settings from /storage/repos/certificate-witnesses-artifact/automizer/config/svcomp-Reach-32bit-Automizer_Bitvector.epf [2024-09-25 11:14:01,320 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-09-25 11:14:01,321 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-09-25 11:14:01,342 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-09-25 11:14:01,343 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-09-25 11:14:01,344 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-09-25 11:14:01,344 INFO L151 SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults: [2024-09-25 11:14:01,347 INFO L153 SettingsManager]: * Use memory slicer=true [2024-09-25 11:14:01,347 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-09-25 11:14:01,347 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-09-25 11:14:01,347 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2024-09-25 11:14:01,348 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2024-09-25 11:14:01,348 INFO L153 SettingsManager]: * Use SBE=true [2024-09-25 11:14:01,349 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-09-25 11:14:01,349 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-09-25 11:14:01,349 INFO L153 SettingsManager]: * sizeof long=4 [2024-09-25 11:14:01,349 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-09-25 11:14:01,349 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-09-25 11:14:01,350 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-09-25 11:14:01,350 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-09-25 11:14:01,351 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-09-25 11:14:01,351 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2024-09-25 11:14:01,351 INFO L153 SettingsManager]: * Use bitvectors instead of ints=true [2024-09-25 11:14:01,351 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-09-25 11:14:01,351 INFO L153 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2024-09-25 11:14:01,351 INFO L153 SettingsManager]: * sizeof long double=12 [2024-09-25 11:14:01,352 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-09-25 11:14:01,352 INFO L153 SettingsManager]: * Use constant arrays=true [2024-09-25 11:14:01,352 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-09-25 11:14:01,353 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2024-09-25 11:14:01,353 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-09-25 11:14:01,353 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-09-25 11:14:01,353 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-09-25 11:14:01,353 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-09-25 11:14:01,354 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-09-25 11:14:01,354 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-09-25 11:14:01,354 INFO L153 SettingsManager]: * Trace refinement strategy=WOLF [2024-09-25 11:14:01,355 INFO L153 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2024-09-25 11:14:01,355 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-09-25 11:14:01,355 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2024-09-25 11:14:01,355 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2024-09-25 11:14:01,355 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-09-25 11:14:01,355 INFO L153 SettingsManager]: * Logic for external solver=AUFBV [2024-09-25 11:14:01,356 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC 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/certificate-witnesses-artifact/automizer/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.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/certificate-witnesses-artifact/automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bb5ad63279572b10ccf828ab50fb4850c30a9bc769c3e514e6f9dd22eeb86526 Applying setting for plugin de.uni_freiburg.informatik.ultimate.boogie.procedureinliner: Inline calls to implemented procedures -> NEVER Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Positions where we compute the Hoare Annotation -> All Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Encode 'modifies' clause in 'ensures' clause of contracts -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: YAML Format version -> 2.1 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Generate GraphML witnesses -> false [2024-09-25 11:14:01,586 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-09-25 11:14:01,600 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-09-25 11:14:01,603 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-09-25 11:14:01,603 INFO L270 PluginConnector]: Initializing CDTParser... [2024-09-25 11:14:01,604 INFO L274 PluginConnector]: CDTParser initialized [2024-09-25 11:14:01,606 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/certificate-witnesses-artifact/automizer/../sv-benchmarks/c/nla-digbench-scaling/knuth_valuebound50.i [2024-09-25 11:14:02,839 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-09-25 11:14:02,990 INFO L384 CDTParser]: Found 1 translation units. [2024-09-25 11:14:02,990 INFO L180 CDTParser]: Scanning /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/nla-digbench-scaling/knuth_valuebound50.i [2024-09-25 11:14:02,997 INFO L427 CDTParser]: About to delete temporary CDT project at /storage/repos/certificate-witnesses-artifact/automizer/data/764810cff/c5e829ed186b465a97fd5b5aa49e99a2/FLAG1f772e9c7 [2024-09-25 11:14:03,006 INFO L435 CDTParser]: Successfully deleted /storage/repos/certificate-witnesses-artifact/automizer/data/764810cff/c5e829ed186b465a97fd5b5aa49e99a2 [2024-09-25 11:14:03,008 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-09-25 11:14:03,009 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-09-25 11:14:03,010 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-09-25 11:14:03,010 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-09-25 11:14:03,014 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-09-25 11:14:03,015 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 11:14:03" (1/1) ... [2024-09-25 11:14:03,015 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20dd51da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:14:03, skipping insertion in model container [2024-09-25 11:14:03,015 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 11:14:03" (1/1) ... [2024-09-25 11:14:03,042 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-09-25 11:14:03,152 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/nla-digbench-scaling/knuth_valuebound50.i[948,961] [2024-09-25 11:14:03,192 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-09-25 11:14:03,210 INFO L200 MainTranslator]: Completed pre-run [2024-09-25 11:14:03,223 WARN L248 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/certificate-witnesses-artifact/sv-benchmarks/c/nla-digbench-scaling/knuth_valuebound50.i[948,961] [2024-09-25 11:14:03,235 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-09-25 11:14:03,252 INFO L204 MainTranslator]: Completed translation [2024-09-25 11:14:03,252 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:14:03 WrapperNode [2024-09-25 11:14:03,253 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-09-25 11:14:03,254 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-09-25 11:14:03,254 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-09-25 11:14:03,254 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-09-25 11:14:03,258 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:14:03" (1/1) ... [2024-09-25 11:14:03,271 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:14:03" (1/1) ... [2024-09-25 11:14:03,277 INFO L138 Inliner]: procedures = 18, calls = 22, calls flagged for inlining = 0, calls inlined = 0, statements flattened = 0 [2024-09-25 11:14:03,277 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-09-25 11:14:03,278 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-09-25 11:14:03,278 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-09-25 11:14:03,278 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-09-25 11:14:03,286 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:14:03" (1/1) ... [2024-09-25 11:14:03,286 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:14:03" (1/1) ... [2024-09-25 11:14:03,291 INFO L184 PluginConnector]: Executing the observer MemorySlicer from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:14:03" (1/1) ... [2024-09-25 11:14:03,306 INFO L175 MemorySlicer]: Split 10 memory accesses to 2 slices as follows [2, 8]. 80 percent of accesses are in the largest equivalence class. The 10 initializations are split as follows [2, 8]. The 0 writes are split as follows [0, 0]. [2024-09-25 11:14:03,306 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:14:03" (1/1) ... [2024-09-25 11:14:03,306 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:14:03" (1/1) ... [2024-09-25 11:14:03,315 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:14:03" (1/1) ... [2024-09-25 11:14:03,319 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:14:03" (1/1) ... [2024-09-25 11:14:03,324 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:14:03" (1/1) ... [2024-09-25 11:14:03,325 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:14:03" (1/1) ... [2024-09-25 11:14:03,327 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-09-25 11:14:03,331 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-09-25 11:14:03,331 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-09-25 11:14:03,331 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-09-25 11:14:03,332 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:14:03" (1/1) ... [2024-09-25 11:14:03,338 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 [2024-09-25 11:14:03,347 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/z3 [2024-09-25 11:14:03,359 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/certificate-witnesses-artifact/automizer/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (exit command is (exit), workingDir is null) [2024-09-25 11:14:03,361 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:4000 (1)] Waiting until timeout for monitored process [2024-09-25 11:14:03,397 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-09-25 11:14:03,398 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1#0 [2024-09-25 11:14:03,398 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1#1 [2024-09-25 11:14:03,398 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2024-09-25 11:14:03,399 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2024-09-25 11:14:03,399 INFO L130 BoogieDeclarations]: Found specification of procedure main [2024-09-25 11:14:03,400 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2024-09-25 11:14:03,400 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2024-09-25 11:14:03,400 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2024-09-25 11:14:03,400 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-09-25 11:14:03,400 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-09-25 11:14:03,400 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2024-09-25 11:14:03,400 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2024-09-25 11:14:03,472 INFO L241 CfgBuilder]: Building ICFG [2024-09-25 11:14:03,474 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2024-09-25 11:14:08,242 INFO L? ?]: Removed 7 outVars from TransFormulas that were not future-live. [2024-09-25 11:14:08,243 INFO L290 CfgBuilder]: Performing block encoding [2024-09-25 11:14:08,262 INFO L312 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-09-25 11:14:08,262 INFO L317 CfgBuilder]: Removed 1 assume(true) statements. [2024-09-25 11:14:08,263 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 11:14:08 BoogieIcfgContainer [2024-09-25 11:14:08,263 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-09-25 11:14:08,264 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-09-25 11:14:08,265 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-09-25 11:14:08,267 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-09-25 11:14:08,267 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.09 11:14:03" (1/3) ... [2024-09-25 11:14:08,268 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48eed5ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 11:14:08, skipping insertion in model container [2024-09-25 11:14:08,268 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 11:14:03" (2/3) ... [2024-09-25 11:14:08,268 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48eed5ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 11:14:08, skipping insertion in model container [2024-09-25 11:14:08,268 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 11:14:08" (3/3) ... [2024-09-25 11:14:08,272 INFO L112 eAbstractionObserver]: Analyzing ICFG knuth_valuebound50.i [2024-09-25 11:14:08,284 INFO L209 ceAbstractionStarter]: Automizer settings: Hoare:All NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-09-25 11:14:08,284 INFO L149 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-09-25 11:14:08,329 INFO L335 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-09-25 11:14:08,334 INFO L336 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, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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;@5d326b33, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-09-25 11:14:08,337 INFO L337 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-09-25 11:14:08,340 INFO L276 IsEmpty]: Start isEmpty. Operand has 34 states, 18 states have (on average 1.5) internal successors, (27), 19 states have internal predecessors, (27), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2024-09-25 11:14:08,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2024-09-25 11:14:08,346 INFO L208 NwaCegarLoop]: Found error trace [2024-09-25 11:14:08,347 INFO L216 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-25 11:14:08,347 INFO L399 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-25 11:14:08,352 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-25 11:14:08,352 INFO L85 PathProgramCache]: Analyzing trace with hash 947536974, now seen corresponding path program 1 times [2024-09-25 11:14:08,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2024-09-25 11:14:08,364 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1429366173] [2024-09-25 11:14:08,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-25 11:14:08,365 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2024-09-25 11:14:08,365 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/mathsat [2024-09-25 11:14:08,367 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/certificate-witnesses-artifact/automizer/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2024-09-25 11:14:08,368 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2024-09-25 11:14:08,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-25 11:14:08,613 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 1 conjuncts are in the unsatisfiable core [2024-09-25 11:14:08,621 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-25 11:14:08,632 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2024-09-25 11:14:08,633 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-09-25 11:14:08,633 INFO L136 FreeRefinementEngine]: Strategy WOLF found an infeasible trace [2024-09-25 11:14:08,634 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1429366173] [2024-09-25 11:14:08,634 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1429366173] provided 1 perfect and 0 imperfect interpolant sequences [2024-09-25 11:14:08,634 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-09-25 11:14:08,634 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-09-25 11:14:08,636 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579749080] [2024-09-25 11:14:08,636 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-09-25 11:14:08,639 INFO L551 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2024-09-25 11:14:08,640 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2024-09-25 11:14:08,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2024-09-25 11:14:08,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-09-25 11:14:08,659 INFO L87 Difference]: Start difference. First operand has 34 states, 18 states have (on average 1.5) internal successors, (27), 19 states have internal predecessors, (27), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2024-09-25 11:14:08,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-09-25 11:14:08,744 INFO L93 Difference]: Finished difference Result 62 states and 95 transitions. [2024-09-25 11:14:08,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2024-09-25 11:14:08,747 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) Word has length 32 [2024-09-25 11:14:08,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-09-25 11:14:08,755 INFO L225 Difference]: With dead ends: 62 [2024-09-25 11:14:08,755 INFO L226 Difference]: Without dead ends: 30 [2024-09-25 11:14:08,758 INFO L433 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2024-09-25 11:14:08,763 INFO L434 NwaCegarLoop]: 41 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 2 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 2 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 2 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-09-25 11:14:08,764 INFO L435 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 41 Invalid, 2 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 2 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-09-25 11:14:08,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2024-09-25 11:14:08,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2024-09-25 11:14:08,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2024-09-25 11:14:08,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2024-09-25 11:14:08,794 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 32 [2024-09-25 11:14:08,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-09-25 11:14:08,795 INFO L474 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2024-09-25 11:14:08,795 INFO L475 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 6.5) internal successors, (13), 2 states have internal predecessors, (13), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 1 states have call successors, (5) [2024-09-25 11:14:08,796 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-25 11:14:08,796 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2024-09-25 11:14:08,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2024-09-25 11:14:08,797 INFO L208 NwaCegarLoop]: Found error trace [2024-09-25 11:14:08,797 INFO L216 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-09-25 11:14:08,815 INFO L540 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2024-09-25 11:14:08,998 WARN L456 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/certificate-witnesses-artifact/automizer/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2024-09-25 11:14:08,999 INFO L399 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-09-25 11:14:09,000 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2024-09-25 11:14:09,002 INFO L85 PathProgramCache]: Analyzing trace with hash -931917038, now seen corresponding path program 1 times [2024-09-25 11:14:09,002 INFO L118 FreeRefinementEngine]: Executing refinement strategy WOLF [2024-09-25 11:14:09,003 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [355921856] [2024-09-25 11:14:09,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-09-25 11:14:09,003 INFO L173 SolverBuilder]: Constructing external solver with command: mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 [2024-09-25 11:14:09,003 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/certificate-witnesses-artifact/automizer/mathsat [2024-09-25 11:14:09,005 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/certificate-witnesses-artifact/automizer/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2024-09-25 11:14:09,006 INFO L327 MonitoredProcess]: [MP /storage/repos/certificate-witnesses-artifact/automizer/mathsat -theory.fp.to_bv_overflow_mode=1 -theory.fp.minmax_zero_mode=4 -theory.bv.div_by_zero_mode=1 -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2024-09-25 11:14:14,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-09-25 11:14:14,617 INFO L262 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-09-25 11:14:14,620 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2024-09-25 11:14:31,544 WARN L293 SmtUtils]: Spent 8.09s on a formula simplification that was a NOOP. DAG size: 3 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2024-09-25 11:14:48,041 WARN L293 SmtUtils]: Spent 8.08s on a formula simplification that was a NOOP. DAG size: 3 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2024-09-25 11:14:56,123 WARN L293 SmtUtils]: Spent 8.08s on a formula simplification that was a NOOP. DAG size: 3 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2024-09-25 11:15:34,218 WARN L293 SmtUtils]: Spent 28.40s on a formula simplification that was a NOOP. DAG size: 42 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-09-25 11:15:46,417 WARN L293 SmtUtils]: Spent 8.07s on a formula simplification that was a NOOP. DAG size: 3 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2024-09-25 11:15:54,499 WARN L293 SmtUtils]: Spent 8.08s on a formula simplification that was a NOOP. DAG size: 3 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2024-09-25 11:16:29,086 WARN L293 SmtUtils]: Spent 28.42s on a formula simplification that was a NOOP. DAG size: 42 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2024-09-25 11:16:41,199 WARN L293 SmtUtils]: Spent 8.07s on a formula simplification that was a NOOP. DAG size: 3 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2024-09-25 11:16:49,278 WARN L293 SmtUtils]: Spent 8.08s on a formula simplification that was a NOOP. DAG size: 3 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2024-09-25 11:16:57,430 WARN L854 $PredicateComparison]: unable to prove that (exists ((v_main_~n~0_BEFORE_CALL_4 (_ BitVec 32)) (v_main_~d~0_BEFORE_CALL_1 (_ BitVec 32))) (and (bvule v_main_~d~0_BEFORE_CALL_1 (_ bv50 32)) (bvule v_main_~n~0_BEFORE_CALL_4 (_ bv50 32)) (not (= (let ((.cse2 (bvadd v_main_~d~0_BEFORE_CALL_1 (_ bv4294967294 32)))) (let ((.cse1 (bvneg (bvudiv v_main_~n~0_BEFORE_CALL_4 v_main_~d~0_BEFORE_CALL_1))) (.cse0 (bvudiv v_main_~n~0_BEFORE_CALL_4 .cse2)) (.cse3 (bvurem v_main_~n~0_BEFORE_CALL_4 v_main_~d~0_BEFORE_CALL_1))) (bvadd (bvneg (bvmul v_main_~d~0_BEFORE_CALL_1 (bvadd (bvmul (_ bv8 32) .cse0) (bvmul (_ bv8 32) .cse1)))) (bvmul (_ bv4 32) (bvmul v_main_~d~0_BEFORE_CALL_1 (bvurem v_main_~n~0_BEFORE_CALL_4 .cse2))) (bvmul (_ bv4 32) (bvmul v_main_~d~0_BEFORE_CALL_1 v_main_~d~0_BEFORE_CALL_1 .cse1)) (bvmul (bvmul v_main_~d~0_BEFORE_CALL_1 v_main_~d~0_BEFORE_CALL_1 .cse0) (_ bv4 32)) (bvneg (bvmul v_main_~d~0_BEFORE_CALL_1 (bvmul .cse3 (_ bv4 32)))) (bvmul .cse3 (_ bv8 32))))) (bvmul (_ bv8 32) v_main_~n~0_BEFORE_CALL_4))))) is different from false [2024-09-25 11:17:01,057 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2024-09-25 11:17:01,057 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2024-09-25 11:17:34,003 WARN L876 $PredicateComparison]: unable to prove that (= (bvmul (_ bv8 32) c_main_~n~0) (let ((.cse3 (bvadd c_main_~a~0 (_ bv4294967294 32)))) (let ((.cse0 (bvudiv c_main_~n~0 .cse3)) (.cse2 (bvurem c_main_~n~0 c_main_~a~0)) (.cse1 (bvneg (bvudiv c_main_~n~0 c_main_~a~0)))) (bvadd (bvneg (bvmul c_main_~a~0 (bvadd (bvmul (_ bv8 32) .cse0) (bvmul .cse1 (_ bv8 32))))) (bvmul (_ bv4 32) (bvmul .cse0 c_main_~a~0 c_main_~a~0)) (bvmul (_ bv8 32) .cse2) (bvmul (_ bv4 32) (bvmul c_main_~a~0 (bvurem c_main_~n~0 .cse3))) (bvneg (bvmul c_main_~a~0 (bvmul (_ bv4 32) .cse2))) (bvmul (_ bv4 32) (bvmul .cse1 c_main_~a~0 c_main_~a~0)))))) is different from true [2024-09-25 11:17:46,653 WARN L293 SmtUtils]: Spent 8.08s on a formula simplification that was a NOOP. DAG size: 4 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2024-09-25 11:17:50,862 WARN L876 $PredicateComparison]: unable to prove that (or (= (bvmul (_ bv8 32) c_main_~n~0) (let ((.cse3 (bvadd c_main_~a~0 (_ bv4294967294 32)))) (let ((.cse0 (bvudiv c_main_~n~0 .cse3)) (.cse2 (bvurem c_main_~n~0 c_main_~a~0)) (.cse1 (bvneg (bvudiv c_main_~n~0 c_main_~a~0)))) (bvadd (bvneg (bvmul c_main_~a~0 (bvadd (bvmul (_ bv8 32) .cse0) (bvmul .cse1 (_ bv8 32))))) (bvmul (_ bv4 32) (bvmul .cse0 c_main_~a~0 c_main_~a~0)) (bvmul (_ bv8 32) .cse2) (bvmul (_ bv4 32) (bvmul c_main_~a~0 (bvurem c_main_~n~0 .cse3))) (bvneg (bvmul c_main_~a~0 (bvmul (_ bv4 32) .cse2))) (bvmul (_ bv4 32) (bvmul .cse1 c_main_~a~0 c_main_~a~0)))))) (not (bvugt c_main_~a~0 (_ bv2 32)))) is different from true [2024-09-25 11:18:03,028 WARN L293 SmtUtils]: Spent 8.09s on a formula simplification that was a NOOP. DAG size: 3 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2024-09-25 11:18:11,197 WARN L876 $PredicateComparison]: unable to prove that (or (not (= |c_assume_abort_if_not_#in~cond| (_ bv0 32))) (forall ((v_main_~a~0_BEFORE_CALL_3 (_ BitVec 32)) (v_main_~n~0_BEFORE_CALL_5 (_ BitVec 32))) (or (bvugt v_main_~a~0_BEFORE_CALL_3 (_ bv2 32)) (= (bvmul (_ bv8 32) v_main_~n~0_BEFORE_CALL_5) (let ((.cse0 (bvadd v_main_~a~0_BEFORE_CALL_3 (_ bv4294967294 32)))) (let ((.cse2 (bvurem v_main_~n~0_BEFORE_CALL_5 v_main_~a~0_BEFORE_CALL_3)) (.cse1 (bvudiv v_main_~n~0_BEFORE_CALL_5 .cse0)) (.cse3 (bvneg (bvudiv v_main_~n~0_BEFORE_CALL_5 v_main_~a~0_BEFORE_CALL_3)))) (bvadd (bvmul (_ bv4 32) (bvmul v_main_~a~0_BEFORE_CALL_3 (bvurem v_main_~n~0_BEFORE_CALL_5 .cse0))) (bvmul (_ bv4 32) (bvmul v_main_~a~0_BEFORE_CALL_3 v_main_~a~0_BEFORE_CALL_3 .cse1)) (bvneg (bvmul (bvmul .cse2 (_ bv4 32)) v_main_~a~0_BEFORE_CALL_3)) (bvmul .cse2 (_ bv8 32)) (bvmul (_ bv4 32) (bvmul v_main_~a~0_BEFORE_CALL_3 v_main_~a~0_BEFORE_CALL_3 .cse3)) (bvneg (bvmul v_main_~a~0_BEFORE_CALL_3 (bvadd (bvmul (_ bv8 32) .cse1) (bvmul (_ bv8 32) .cse3))))))))))) is different from true [2024-09-25 11:18:23,355 WARN L293 SmtUtils]: Spent 8.08s on a formula simplification that was a NOOP. DAG size: 3 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2024-09-25 11:18:39,723 WARN L293 SmtUtils]: Spent 8.09s on a formula simplification that was a NOOP. DAG size: 3 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2024-09-25 11:18:47,892 WARN L876 $PredicateComparison]: unable to prove that (or (= (_ bv0 32) c_assume_abort_if_not_~cond) (not (= |c_assume_abort_if_not_#in~cond| (_ bv0 32))) (forall ((v_main_~a~0_BEFORE_CALL_3 (_ BitVec 32)) (v_main_~n~0_BEFORE_CALL_5 (_ BitVec 32))) (or (bvugt v_main_~a~0_BEFORE_CALL_3 (_ bv2 32)) (= (bvmul (_ bv8 32) v_main_~n~0_BEFORE_CALL_5) (let ((.cse0 (bvadd v_main_~a~0_BEFORE_CALL_3 (_ bv4294967294 32)))) (let ((.cse2 (bvurem v_main_~n~0_BEFORE_CALL_5 v_main_~a~0_BEFORE_CALL_3)) (.cse1 (bvudiv v_main_~n~0_BEFORE_CALL_5 .cse0)) (.cse3 (bvneg (bvudiv v_main_~n~0_BEFORE_CALL_5 v_main_~a~0_BEFORE_CALL_3)))) (bvadd (bvmul (_ bv4 32) (bvmul v_main_~a~0_BEFORE_CALL_3 (bvurem v_main_~n~0_BEFORE_CALL_5 .cse0))) (bvmul (_ bv4 32) (bvmul v_main_~a~0_BEFORE_CALL_3 v_main_~a~0_BEFORE_CALL_3 .cse1)) (bvneg (bvmul (bvmul .cse2 (_ bv4 32)) v_main_~a~0_BEFORE_CALL_3)) (bvmul .cse2 (_ bv8 32)) (bvmul (_ bv4 32) (bvmul v_main_~a~0_BEFORE_CALL_3 v_main_~a~0_BEFORE_CALL_3 .cse3)) (bvneg (bvmul v_main_~a~0_BEFORE_CALL_3 (bvadd (bvmul (_ bv8 32) .cse1) (bvmul (_ bv8 32) .cse3))))))))))) is different from true